Object caching is a process that stores database query results in order to quickly bring them back up the next time they are needed. As a result, it's more efficient and reduces massive unnecessary loads on your website.
This is especially important for websites that can be configured using Memcached as an object cache storage. E.g., websites using WordPress are fully ready to use an object cache. Only an additional plugin needs to be installed.
Read all about it in our blog post.