A brief explanation how Drupal cache works... Include the different modules provided by Drupal to manage cache

Drupal cache is one of the major subsystems that deliver Drupal's flexibility for devs.  In a nutshell, Drupal cache is about speeding up the time to render a page to a user.  Vanish or similar pending server-side set-up makes caching more efficient.

Drupal modules - to name a few Internal Dynamic Page Cache, Internal Page Cache, System