Hi,
vSphere Essentials already includes vCenter for essentials (limited to manage 3 ESXi hosts), since the Essentials license is a bundle.
So you've just got all you need:-)
There are 3 versions of vcenter:
1) vcenter for essentials: included in every Essentials bundles, limited to manage 3 ESXi nodes (also with Essentials license)
2) vcenter foundation: limited to manage 3 ESXi nodes (of every other Edition of vSphere)
3) vcenter standard: not limited
About the various vCenter products:
- vcenter --> Ok, it's vcenter
- vcenter server --> same as point 1.
- vcenter operations --> a separate product that integrates with vCenter, providing some higher level management, performance reporting, compliance checking, and many more
- vcenter product family --> it's just the group of products that integrates with vcenter
- vcenter server heartbeat --> a product for keeping vcenter in high availability: it replicates an instance of vcenter between two machines, even over WAN link
- vcetner orchistrator --> a powerful tool for deep automation (of complex infrasctructures)
- hundreds of other similarly named products with the word vsphere in them --> ......
Regards