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A game engine is a software framework designed for the creation and development of video games. Developers use them to create games for consoles, mobile devices and personal computers.
From DoomWiki.org. The name Doom engine refers to the parts of the software that power or run the Doom and Doom II games, as opposed to the assets and resources (data) of said games. In a strict sense, the engine is the executable elements of the games, based on the corresponding source code, as opposed to WAD and lump files.