What is the purpose of the Lock command in a sketch?

The Lock command in a sketch is specifically used to limit the movement of a segment. When a segment is locked, it becomes constrained and will not move when other elements of the sketch are adjusted or modified. This helps maintain the intended design geometry while allowing other parts of the sketch to be flexible. Locking a segment ensures that it retains its position relative to other sketches or geometric features, which is essential for maintaining the accuracy and integrity of the overall design.

Understanding the function of the Lock command is crucial for effective sketching, as it aids in controlling the relationships between different entities in the sketch environment.