Maintainability refers to how easily a system, product, or software can be updated, repaired, or improved. High maintainability means that changes can be made quickly and with minimal effort, which is essential for keeping systems efficient and relevant over time. Factors that influence maintainability include clear documentation, modular design, and the use of standard components. These elements help technicians and developers understand and modify the system without extensive training or resources, ultimately leading to reduced downtime and lower maintenance costs.