Use this tag when the question is **primarily** about the underlying ideas behind how something works. This tag should be used in conjunction with another tag for the area of interest, for example [electrical] or [suspension]. It should not be used "stand alone." Please use the [engine-theory] tag for those questions.

Use this tag when the question is primarily about the underlying ideas behind how something works. This tag should be used in conjunction with another tag for the area of interest, for example or . It should not be used "stand alone." Please use the tag for those questions.