Web Hosting Glossary – Terms and Definitions

A

A Record

An A record is a DNS record that connects a domain name or subdomain to an IPv4 address. It tells browsers and other services which server should receive requests for that hostname. Example:

example.com → 192.0.2.1

Addon Domain

An addon domain is an additional domain hosted within an existing hosting account. Depending on the hosting platform, each addon domain can point to its own website directory and operate as a separate website.

Apache

Apache HTTP Server is open-source web server software used to deliver websites and web applications to visitors. It can process HTTP requests, serve files, and work with technologies such as PHP.

AutoSSL

AutoSSL is a hosting feature that automatically issues, installs, and renews SSL/TLS certificates for eligible domains, helping websites maintain HTTPS connections without manually renewing certificates.

B

Backup

A backup is a stored copy of website files, databases, configurations, or other data that can be used to restore a website after data loss, corruption, an unsuccessful update, or another problem.

Bandwidth

Bandwidth refers to the amount of data transferred between a hosting server and its visitors over a period of time. Website traffic, images, downloads, video, and other resources can contribute to bandwidth usage.

Bare Metal Server

A bare metal server is a physical server dedicated to a single customer rather than divided among multiple virtual server environments. It provides direct access to the server's hardware resources.

Browser Cache

Browser caching allows a visitor's browser to temporarily store website resources such as images, CSS, and JavaScript files. Returning visitors may then load those resources locally instead of downloading them again.

C

Cache

A cache temporarily stores frequently requested data so it can be delivered more quickly. Website caching can reduce server processing, improve page load times, and decrease repeated requests for the same resources.

CDN

A CDN (Content Delivery Network) is a distributed network of servers that delivers website resources from locations closer to visitors. A CDN can improve performance, reduce origin server load, and provide additional availability and security features.

Cloud Hosting

Cloud hosting uses interconnected computing resources rather than relying entirely on a single physical server. Depending on the platform, resources can be distributed or scaled to support changing website requirements.

cPanel

cPanel is a web hosting control panel used to manage hosting accounts, domains, email, files, databases, DNS settings, backups, and other server-related features through a graphical interface.

CPU

CPU (Central Processing Unit) resources represent the processing capacity available to a hosting environment. Websites requiring extensive PHP processing, database operations, or application tasks may consume more CPU resources.

D

Database

A database stores structured information used by websites and applications. Content management systems such as WordPress use databases to store posts, pages, settings, user information, and other website data.

Dedicated Hosting

Dedicated hosting provides a physical server dedicated to one customer or organization. It offers greater control over server resources and configuration than typical shared hosting environments.

Disk Space

Disk space is the amount of server storage available for website files, databases, email, backups, logs, and other hosting data.

DNS

DNS (Domain Name System) translates human-readable domain names into information computers use to locate services on the internet, including the IP addresses of web servers.

DNS Record

A DNS record contains instructions for how a domain should route specific types of internet traffic. Common records include A, AAAA, CNAME, MX, TXT, and NS records.

Domain Name

A domain name is the human-readable address used to reach a website, such as example.com. DNS connects the domain to the server or service responsible for handling requests.

E

Email Hosting

Email hosting provides the infrastructure required to send, receive, and store email using addresses associated with a domain, such as [email protected].

Error Log

An error log records server, application, PHP, or website errors. Reviewing error logs can help diagnose failed requests, configuration problems, application errors, and other technical issues.

F

File Manager

A file manager is a browser-based hosting tool used to upload, download, edit, move, copy, and delete files stored within a hosting account.

Firewall

A firewall monitors and controls network traffic according to defined security rules. Hosting firewalls can help restrict unauthorized connections and reduce exposure to malicious traffic.

FTP

FTP (File Transfer Protocol) is a protocol used to transfer files between a local computer and a remote server. Secure alternatives such as SFTP are generally preferred when available.

G

gzip Compression

gzip compression reduces the size of compatible files before they are transferred from a server to a visitor's browser, which can reduce transferred data and improve page delivery.

H

Hosting Control Panel

A hosting control panel is a graphical interface for managing websites and server-related features such as domains, files, databases, email, DNS, backups, and security settings.

HTTP

HTTP (Hypertext Transfer Protocol) is the protocol used to transfer web resources between clients, such as browsers, and web servers.

HTTP/2

HTTP/2 is a version of HTTP designed to improve web communication efficiency through features such as multiplexing and header compression.

HTTP/3

HTTP/3 is a newer generation of HTTP that uses QUIC as its transport protocol and is designed to improve connection performance and resilience under varying network conditions.

HTTPS

HTTPS is HTTP transmitted over an encrypted TLS connection. It helps protect information exchanged between a visitor's browser and the website server.

I

IP Address

An IP address is a numerical identifier used to locate and communicate with devices and servers on a network. DNS allows domain names to point to the appropriate IP addresses.

IPv4

IPv4 is a widely used version of the Internet Protocol that uses 32-bit addresses. Example:

192.0.2.1

IPv6

IPv6 is a newer version of the Internet Protocol designed with a much larger address space than IPv4 and additional improvements for modern internet networking.

L

Linux Hosting

Linux hosting uses a Linux-based server operating system. It is commonly used for websites built with PHP, WordPress, MySQL or MariaDB, and other open-source web technologies.

Load Balancing

Load balancing distributes incoming requests across multiple servers or computing resources. It can help improve scalability, availability, and performance for high-traffic applications.

M

Managed Hosting

Managed hosting includes hosting infrastructure along with provider-managed services that may include server maintenance, security, backups, monitoring, updates, or performance optimization depending on the hosting plan.

MariaDB

MariaDB is an open-source relational database management system commonly used by websites and web applications, including WordPress hosting environments.

MySQL

MySQL is a relational database management system widely used to store and retrieve data for websites and applications.

N

Nameserver

A nameserver is part of the DNS infrastructure responsible for answering DNS queries for a domain. Domain registrations specify authoritative nameservers that identify where the domain's DNS records are managed.

Nginx

Nginx is web server and reverse proxy software commonly used to deliver web content, handle connections, proxy requests, and support high-performance hosting environments.

P

PHP

PHP is a server-side scripting language widely used in web development. WordPress and many other content management systems use PHP to generate dynamic webpages.

PHP Memory Limit

The PHP memory limit defines the maximum amount of memory a PHP process or script is allowed to use. Insufficient memory can cause applications or WordPress operations to fail.

phpMyAdmin

phpMyAdmin is a browser-based application used to manage MySQL and MariaDB databases, including tables, records, queries, imports, and exports.

Propagation

DNS propagation refers to the period during which DNS changes become visible through DNS resolvers and cached records across the internet. The timing can vary based on caching and TTL settings.

R

Reverse Proxy

A reverse proxy receives requests from visitors and forwards them to another server or application. Reverse proxies can be used for caching, security, load balancing, SSL termination, and traffic management.

Root Directory

The root directory is the primary directory from which a website or hosting environment serves or organizes its files. The exact location and terminology depend on the hosting platform.

S

Server

A server is a computer or computing environment that provides resources, data, or services to other devices. Web servers process requests and deliver website content to visitors.

Shared Hosting

Shared hosting places multiple customer accounts or websites on the same server infrastructure, where they share available computing resources according to the hosting provider's configuration.

SFTP

SFTP (SSH File Transfer Protocol) provides encrypted file transfer over an SSH connection and is commonly used to securely manage website files on remote servers.

SSL Certificate

An SSL/TLS certificate allows a website to establish authenticated, encrypted HTTPS connections with visitors. Although the term SSL certificate remains common, modern secure connections use TLS.

Staging Environment

A staging environment is a separate copy or environment used to test website changes before they are deployed to the live production website.

Subdomain

A subdomain is a subdivision of a primary domain that can be used for a separate website, application, or section. Example:

support.example.com

T

TLS

TLS (Transport Layer Security) is the protocol used to encrypt modern HTTPS connections between browsers, servers, and other network services.

TTL

TTL (Time to Live) specifies how long certain DNS information may be cached before a resolver should request updated information from the authoritative source.

TTFB

TTFB (Time to First Byte) measures the time between initiating a request and receiving the first byte of the response. It can be influenced by network latency, server processing, caching, and hosting configuration.

U

Uptime

Uptime describes the amount or percentage of time a website, server, or service remains operational and available during a specified period.

V

Virtual Host

A virtual host allows a web server to serve multiple websites or domains from the same server by using configuration rules to determine which website should respond to a request.

VPS

A VPS (Virtual Private Server) is a virtualized server environment with allocated computing resources. It provides greater isolation and control than typical shared hosting while running on underlying physical infrastructure shared with other virtual servers.

W

WAF

A WAF (Web Application Firewall) analyzes web traffic and applies security rules intended to help block malicious or unwanted requests before they reach a web application.

Web Hosting

Web hosting is a service that provides the infrastructure and resources required to store, operate, and make a website accessible over the internet.

Web Server

A web server receives HTTP or HTTPS requests and returns website resources or application responses. Apache and Nginx are examples of widely used web server software.

WHM

WHM (WebHost Manager) is a server and hosting account management interface commonly used alongside cPanel. Depending on access level, it can be used to manage hosting accounts, server configuration, services, and related settings.

WordPress Hosting

WordPress hosting is a hosting environment or service designed to run WordPress websites. Features vary by provider and may include WordPress-specific caching, backups, security, staging, updates, or management tools.

0–9

301 Redirect

A 301 redirect indicates that a resource has permanently moved to another URL. It is commonly used during website migrations, URL changes, and other situations where the old address should permanently forward to a new location. Example:

HTTP/1.1 301 Moved Permanently

403 Forbidden

A 403 Forbidden response indicates that the server understood the request but is refusing access to the requested resource. Example:

HTTP/1.1 403 Forbidden

404 Not Found

A 404 Not Found response indicates that the server could not find the requested resource at the specified URL. Example:

HTTP/1.1 404 Not Found

500 Internal Server Error

A 500 Internal Server Error indicates that the server encountered an unexpected condition that prevented it from completing the request. Example:

HTTP/1.1 500 Internal Server Error

502 Bad Gateway

A 502 Bad Gateway response indicates that a server acting as a gateway or proxy received an invalid response from an upstream server. Example:

HTTP/1.1 502 Bad Gateway

503 Service Unavailable

A 503 Service Unavailable response indicates that the server is temporarily unable to handle the request, such as during maintenance or periods of excessive load. Example:

HTTP/1.1 503 Service Unavailable