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HTTPD - Apache2 Web Server

A Web server is a software responsible for accepting HTTP requests from clients, which are known
as Web browsers, and serving them HTTP responses along with optional data contents, which usually
are Web pages such as HTML documents and linked objects (images, etc.).
Apache is the most commonly used Web Server on Linux systems. Web Servers are used to serve
Web Pages requested by client computers. Clients typically request and view Web Pages using Web
Browser applications such as Firefox, Opera, or Mozilla.
Users enter a Uniform Resource Locator (URL) to point to a Web server by means of its Fully
Qualified Domain Name (FQDN) and a path to the required resource. For example, to view the home
page of the Ubuntu Web site1 a user will enter only the FQDN. To request specific information about
paid support2, a user will enter the FQDN followed by a path.
The most common protocol used to transfer Web pages is the Hyper Text Transfer Protocol (HTTP).
Protocols such as Hyper Text Transfer Protocol over Secure Sockets Layer (HTTPS), and File
Transfer Protocol (FTP), a protocol for uploading and downloading files, are also supported.
Apache Web Servers are often used in combination with the MySQL database engine, the HyperText
Preprocessor (PHP) scripting language, and other popular scripting languages such as Python and
Perl. This configuration is termed LAMP (Linux, Apache, MySQL and Perl/Python/PHP) and forms a
powerful and robust platform for the development and deployment of Web-based applications.
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