Our movement basically depends on the bones, ligaments, muscles and tendons. They all work together in a healthy body in response to signals from the brain. Tendon are a tough band of connective tissues in joints their function is to join and transmit force between muscles and the bones whereas muscle is a soft tissue which you can compare with “engine” that your body uses for the movement.
So when your brain sends a signal for movement your muscle contracts/relax, the force travels through the tendons, which then pull/push the bone which needs to move.
Hope this helps. 🙂