Caching tables

Eleven of the 74 core Drupal 7 tables are to support caching. Below, each of these tables are enumerated and their purpose is described:

cache: Caches items not separated out into their own cache tables.
cache_block: The block modules can cache already built blocks here.
cache_bootstrap: Data required during the bootstrap process can be cached in this table.
cache_field: Stores cached field values.
cache_filter: Caches already filtered pieces of text.
cache_form: Caches recently built forms and their storage data. Note that this table differs from other cache tables: it is not cleared by drupal_flush_all_caches()
cache_image: Caches information about image manipulations that are in progress.
cache_menu: Caches router information as well as generated link trees.
cache_page: Caches compressed pages served to anonymous users.
cache_path: Caches path aliases.
cache_update: Caches information of project update and core releases.