Define Joints .

Explanation

### Step-by-Step Text Solution:

1. **Definition of Joints**: A joint is defined as a part of the body where two or more bones come together or meet.

2. **Composition of Joints**: Joints consist of cartilage, which is a flexible tissue that covers the surfaces of the bones at the joint. This cartilage helps to reduce friction and absorb shock during movement.

3. **Function of Joints**: The primary function of joints is to facilitate movement. They allow the bones to move relative to one another, enabling various types of motion. However, it's important to note that not all joints allow for movement; some are fixed or immovable.

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