Caching
The process of storing pre-generated versions of web pages or data so future requests are served faster without repeating expensive processing.
Caching is the process of storing a saved version of content so it can be served faster on subsequent requests. In WordPress, page caching generates static HTML versions of pages and serves them to visitors instead of running PHP and database queries on every request.
Types of WordPress caching include: page caching (full HTML pages), object caching (database query results, using Redis or Memcached), browser caching (files stored in the visitor’s browser), and opcode caching (compiled PHP stored in memory). Popular caching solutions include WP Rocket, LiteSpeed Cache, and W3 Total Cache.