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An "assembly" is set of manufactured parts or components that work together in unison as one mechanism or device.

Drop-in replacement or just "Drop-in" is a term used to describe the ability to replace one hardware (or software) component with another one without any initial preparation or configuration changes being required, and resulting in no negative operational impact. Drop in components may also refer to items designed to fit exactly into an existing opening, such as in a countertop or refrigerated cabinet.