It connects your two legs, the long part (shin bone) and the flat part (foot), and lets you move your foot up and down. This hinge is important for walking, running, and jumping.

Example

1. After jumping on the trampoline, I landed wrong and twisted my ankle.
2. Stretch your toes and ankles before you start running.
3. Socks that go up to your ankles are called crew socks.