Overhauling refers to the process of inspecting, cleaning, testing, and repairing or replacing the necessary parts of a mechanical system. The purpose of an overhaul is to keep the system operating as effectively and reliably as possible by identifying and fixing any existing or potential issues. Overhauling can be applied to various fields such as vehicle engines, aircraft maintenance, computers, and appliances among others. It's an extensive and detail-oriented process that can greatly extend the lifespan of the equipment in consideration.