PHP stands for Hypertext Preprocessor. PHP is a powerful and widely-used open source server-side scripting language to write dynamically generated web pages. PHP scripts are executed on the server and the result is sent to the browser as plain HTML. PHP can be integrated with the number of popular databases, including MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL Server. PHP can be embedded within a normal HTML web pages.

1. PHP is an acronym for "PHP: Hypertext Preprocessor".
2. PHP is a widely-used, open source scripting language.
3. PHP scripts are executed on the server.
4. PHP is free to download and use.