What is the Unreal engine and Crytek engine?

Q: I’m new to 3D software and stuffs and I’m planning to learn these kind of software.

I’m only planning to learn only 1 software at a time.

I heard about Maya and Softimage and I was planning to buy it, yet I heard about the Unreal Engine stuff which is pretty famous and also the Crytek Engine.

What is Unreal Engine and Crytek engine anyway?

Are those software editing tools like Maya? or just plug-ins for Maya,3Ds Max and Softimage?

please help I’m kind of confused.

I can’t buy a software product because there are lots of things that are entirely new.

I’m really confused if these Unreal engines stuff are plug-ins or just plain software like Maya?.

Can also Unreal Engines capable for Cinematics?