Drupal is a free and open-source web content management system written in PHP and distributed under the GNU General Public License. Drupal provides an open-source back-end framework for at least 14% of the top 10,000 websites worldwide – ranging from personal blogs to corporate, political, and government sites. 

LEMP refers to a collection of open-source software that is commonly used together to serve web applications. The term LEMP is an acronym that represents the configuration of a Linux operating system with an nginx (pronounced engine-x, hence the E in the acronym) web server, with site data stored in a MySQL database and dynamic content processed by PHP. 

If you need any support related to Drupal CMS Installation in your Linux system, you can hire me.