Apache Web Server is a free, open-source web server software that powers over 60% of all web servers on the internet. Its popularity is derived from its ability to run on a wide range of operating systems, including UNIX-based ones like Linux and FreeBSD, macOS, and Windows.

The Apache Web Server software is maintained by the Apache Software Foundation, and it has been available since 1995. The software is written in C language and is designed to handle HTTP requests and serve files over the internet.

Apache Web Server is renowned for its extensibility and flexibility. It supports modules that enable additional functionality, such as server-side scripting, URL rewriting, and authentication. It also has the capability to serve multiple websites on the same server, allowing web hosts to manage multiple sites with a single installation.

Installing Apache Web Server is straightforward and can be done on most operating systems. Once installed, the server can be configured using the httpd.conf configuration file, which contains settings such as port numbers, document root directories, and SSL certificates.

One of the key benefits of using Apache Web Server is its security features. Apache features a robust authentication system that allows webmasters to choose from a variety of authentication methods, such as password-based authentication or user certificates. It also supports SSL/TLS encryption, which ensures that Internet traffic between the server and client is secure.

Apache Web Server is also famous for its scalability. The server can handle multiple requests simultaneously, meaning it can serve a large number of clients without any significant performance degradation. Its modular architecture allows developers to add new modules to extend its functionality and customize its behavior to meet their needs.

In conclusion, Apache Web Server is a versatile, powerful, and reliable web server software that is trusted by millions of users worldwide. Its open-source nature and extensive customization options make it a popular choice for web hosting companies, small businesses, and web developers looking for a flexible, feature-rich platform. With its ability to handle multiple requests, scalability, and robust security, Apache Web Server is a solid choice for web hosting and development.