Drupal gives you various methods of caching your site's data and content by using the Drupal core administrative interface. There are a variety of contributed modules that allow for more advanced caching (we'll look at these in later chapters). Drupal allows you to cache data and content in order to speed up the performance of your site in terms of how quickly your pages and entire site loads for the end user.
Caching as much data and content as possible, especially the content that you show to your anonymous site visitors which includes content, blocks, and menus that may not change frequently, will help Drupal to speed up page load times on your site. Drupal will keep the cached data stored in a temp location either on the server or in the MySQL database. The site can easily fetch it for load time from that location.
Drupal does this by storing cached data in specific database tables of your MySQL database, so it can easily retrieve the cached data instead...