Asoftware engine is a corecomponent of acomplexsoftware system. The word "engine" is ametaphor of acar'sengine. Thus a software engine is a complexsubsystem; not unlike how a car engine functions.Software engines work in conjunction with othercomponents of a process or system. They typically have an input and an output, and the productivity is usually linear torunning speed.

There is no formal guideline for what should be called an engine, but the term has become widespread in thesoftware industry.^[1][2][3]

• Mainstreamweb browsers have both arendering engine and aJavaScript engine.

• Video games are often based on agame engine. Some of these also have specializedphysics orgraphics engines.

• Software engineering

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