O & m stands for operations and maintenance. It refers to the activities and procedures used to manage and maintain the performance, condition, and safety of the company's facilities, assets, and infrastructure. O & M activities include implementing preventative maintenance, repairing and upgrading facilities, monitoring performance, and ensuring safety standards are being met. By having an effective O & M system in place, a company is able to anticipate and prevent potential problems so that it can remain profitable and efficient.