The engine is simply the program which was used to make the game.
You may have heard of the “unity” or “unreal” engines. These are commercial engines which anyone can download and… make a game with.
A lot of developers just build an engine from scratch to suit a specific game they have in mind (and to avoid paying royalties in using someone else’s engine)
Edit: interesting factoid, Bethesda has been using the same engine for their games since 2002’s TES 3: Morrowind, although heavily updated and modified.
Fallout 76 even had a few of the same glitches that Morrowind had
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