Repair is a response to physical or chemical damage. It entails the restoration of the tissue to its unaltered state. Maintenance, on the other hand, refers to the normal functioning of a tissue or organ. It is necessary for homeostasis and involves activities that are not overtly harmful to the tissue but keep it functioning within normal parameters.
Repair is a physical or mechanical process that restores or replaces deteriorated or damaged materials with new materials of the same kind. Maintenance, on the other hand, is an ongoing program of activities aimed at preserving and protecting something from deterioration or damage. In the context of buildings and infrastructure, repair usually means repairing broken parts (e.g., fixing a hole in a roof) while maintenance refers to activities such as painting, cleaning, and checking for corrosion or other problems that could lead to future damage.
