Cron is a job scheduler, which helps to set the list of tasks, supposed to be executed periodically. However, if you are a Drupal developer and wondering how to add the drupal cron to the cron tab, here is the way.
Drupal depends on a cron system to execute period tasks in Drupal. This cron system in turn expects a call to the cron.php file from a client either as a Drupal shell request or as an http request to the Drupal site. The following outlines how to set up a cron job in an Amazon AWS server set up using the bitnami stack.