What is Drupal
Drupal is a free and open source Content Management System built on PHP, with a modular design allowing features to be added and removed by installing and uninstalling modules, and allowing the entire look and feel of the website to be changed by installing and uninstalling themes. That allows organizing, managing and publishing your content.
Download the Drupal package (https://www.drupal.org/project/drupal) and copy it to your web server.
Install through Composer -> Open command line ,Locate to the web server and run the below command
composer create-project drupal-composer/drupal-project:7.x-dev -n folderName