vSphere Replication is bundled in almost all vSphere editions (except the Essentials kit). This tool is able to cover many use cases of virtual machine replication, up to a complete site protection.
This article series will take you through the steps of implementing vSphere Replication, by starting with a conceptual overview, and then deploying, configuring and using the product. At the end you should be familiar with the product and ready to use it in production!
Beside this article series, you could also be interested by a few more things: