User:Consumed Crustacean/sandbox/Game engine

Start organization, but I'm going to pick up a few books and see how their authors approach this before settling.

Lede should provide a good (and correct) definition or range; impact, use, notability; disciplines; points of difference between engines. Summarize.

What makes a game engine
I'm imagining opening up with the definition, classification, etc. to provide context for what follows. But not sure about this yet.

Engine use
Who is using game engines? Why do they use game engines?

History
Obviously.

Rendering systems
Is this becoming too nested?

Types of engines
?????

Alternatives
Comparisons with non-engines (libraries, frameworks, rendering engines) that are used sometimes as backbones.

Engine licensing
Recent trends in licensing of major game engines?