XAMPP is an open source, cross-platform tool, which is a favourite among Web developers. The full form of XAMPP is X-Cross platform, Apache, MariaDB, PHP and Perl. Earlier, it used MySQL instead of MariaDB. XAMPP is a complete package of these libraries, so developers don’t need to worry about installing and configuring PHP, MariaDB and Apache. It’s the simplest way to set up a local Web server.