Operations & Maintenance (O&M means the functions, duties and labor associated with the daily operations and normal repairs, replacement of parts and structural components, and other activities needed to preserve an asset so that it continues to provide acceptable services and achieves its expected life.
Service is provided to keep a product in good operating condition. One of the strong selling points for the rise of software as a service was that all program maintenance is provided by the vendor of the application.The technical meaning of maintenance involves functional checks, servicing, repairing or replacing of necessary devices, equipment, machinery, building infrastructure, and supporting utilities in industrial, business, and residential installations.