Object caching is when a piece of software stores database query results so that the next time a result is needed, it can be served from the cache. This means the database doesn’t have to be re-read if the same query is sent more than once. When object caching has been enabled on your WordPress site, it may help ease the load on your server and your database. This is very handy for larger websites that may have thousands of requests during peak hours. Some WordPress caching plugins have these features installed, or you could try something like the Redis Object Cache plugin. These types of WordPress plugin are only for advanced users and websites with large databases such as WooCommerce websites.