MRO stands for Maintenance, Repair, and Operations. This term refers to the type of materials and supplies used in various maintenance, repair, and operations activities. MRO products are distinct from other procurement categories such as raw materials or plant equipment, as they are generally purchased in lower quantities and consist of finished items with a wide range of potential uses. These items can include replacement parts, safety supplies, hand tools, electrical components, fasteners, industrial supplies, janitorial products, and more. In short: MRO is the stuff you need to keep things running.