WordPress does not have a built-in caching mechanism. However, many people use a caching plugin to help improve performance.
When caching is enabled, some types of changes (such as theme modifications) do not appear immediately. This article discusses how to clear the cache so you can be certain you are viewing the most recent version of your site.
W3 Total Cache is a popular caching plugin for WordPress. In fact, the L3 Optimized for WordPress plugin uses W3 Total Cache to provide caching services.
If you have either of these plugins installed on your WordPress site, follow these steps to clear the cache:
If you use a caching plugin other than the L3 Optimized for WordPress plugin or W3 Total Cache, consult the plugin's documentation for information about how to clear the cache.
For more information about using caching with WordPress, please visit https://codex.wordpress.org/I_Make_Changes_and_Nothing_Happens.