What is LAMP? LAMP means Linux Apache Mysql Php What is LAMP stack used for? The widely popular LAMP stack is a set of open source software used for web application development. For a web application to work smoothly, it has to include an operating system, a web server, a database, and a programming language. What is MySQL and why it is used? MySQL is a freely available open source Relational Database Management System (RDBMS) that uses Structured Query Language (SQL). SQL is the most popular language for adding, accessing and managing content in a database. ... MySQL is an essential part of almost every open source PHP application.