The technical meaning of maintenance involves operational and functional checks, servicing, repairing or replacing of necessary devices, equipment, machinery, building infrastructure, and supporting utilities in industrial, business, governmental, and residential installations.Over time, this has come to often include both scheduled and preventive maintenance as cost-effective practices to keep equipment ready for operation at the utilization stage of a system life cycle.
The desktop, printer, laptop and facility management hardware depend on maintenance, repair and overhaul (MRO) including scheduled or preventive paint maintenance programmed to maintain and restore coatings applied to steel in environments subject to attack from erosion, corrosion and environmental pollution.