WordPress Caching Guide
Caching reduces repeated work by reusing previously generated responses or resources. In WordPress, several cache layers can exist at once, so understanding the layer you are changing matters.
Page caching
Serve a prepared page instead of rebuilding it through PHP and database work for every eligible visit.
Browser caching
Let visitors reuse eligible static resources locally according to cache rules.
Preloading
Warm eligible caches before a real visitor requests a page.
Cache layers can overlap
Your browser, WordPress plugin, web server, host, reverse proxy, and CDN can all participate. When content appears stale, identify which layer is serving it before clearing everything.
Where to go next
Read page caching, browser caching, cache preloading, and cache troubleshooting. When you are ready to choose a tool, see best WordPress cache plugins.