Patching a server using Satellite

A new Linux admin here.
Considering we have a running Satellite in the environment, I had a question (Our main Linux resource is no longer here).
When we apply a patch on RedHat7.6 server using Satellite, does that mean only Installing available Errata's from the "Errata" tab or do I have to install the Packages from the "Packages" tab as well?

In "Packages" tab, I see Package Install, Package Update, Package Remove..etc items in drop down list and also a button called "Update All Packages".

What does actually a server patch mean?