Lamp stands for Linux Apache Mysql Php .

Basically it includes Apache Mysql Php (combination of open source products).

Install Mysql Apache PHP in one package in Ubuntu 11.04.The simplest and most likely to be used approach is to use the following command in terminal:

sudo apt-get install lamp-server^

The command initiates the download of LAMP server to your PC with a password prompt and when finished, its done!
Open your browser and type the following:

http://localhost/

and hit enter. If you get the following screen, then Apache definitely works.
To access MySQL, you can use the following URL:

http://localhost/phpmyadmin