No, the heel itself is not a joint, but it participates in forming a joint.
The heel bone, also known as the calcaneus, is a bone located at the back of the foot. It articulates (connects) with the talus bone to form the subtalar joint. This joint is critical for side-to-side movement of the foot, which is essential for walking on uneven surfaces.
Therefore, the heel bone is a component of the subtalar joint, but the heel itself is not a joint. A joint requires the articulation of two or more bones to allow movement.