WAMP is an acronym that stands for Windows, Apache, MySQL, and PHP. It's a software stack which means installing WAMP installs Apache, MySQL, and PHP on your operating system (Windows in the case of WAMP). Even though you can install them separately, they are usually bundled up, and for a good reason too.
What's good to know is that WAMP derives from LAMP (the L stands for Linux). The only difference between these two is that WAMP is used for Windows, while LAMP – for Linux based operating systems.

Features:

• Preconfigured WAMP-System with Apache, PHP, MySQL, phpMyAdmin, Mercury/32 Mail-Server and SQLite.
• Equally useful for developers as for productive usage. Thanks to switchable settings between security and developer-functionality.
• Centralized GUI for all important features of the above applications.
• Assistant to operate the applications as a restricted user.
• Add-on system for reloading and integration of other applications (such as Tomcat, Python, SVN, etc.) from the network.
• 1-Click Installer for popular web applications such as phpBB, WordPress u.v.a.
• Assistant for performance tuning with automatic Evaluation of the System configuration (number of CPUs, RAM, etc).
• Editor for the Windows HOSTS file to create "virtual domains".
• dynamic and automatic updates of individual components (Apache, MySQL, etc.) directly from the software.
• Focus on a lightweight and fast system - the complete setup consists of only a few MB file.