Watch maintenance involves regular care and servicing to ensure a timepiece functions accurately and lasts longer. This includes cleaning the watch, checking the movement, and replacing worn-out parts. For mechanical watches, it's essential to have them serviced every 3 to 5 years to keep them in optimal condition. Battery-operated watches also require maintenance, primarily through battery replacement. Additionally, water resistance should be checked periodically, especially for watches designed for diving or outdoor activities. Proper storage and handling can further extend the life of a watch, making maintenance an important aspect of watch ownership.