What are synovial joints? Explain.

Explanation

### Step-by-Step Solution:

1. **Definition of Synovial Joints**:
- Synovial joints are a type of joint in the body that allows for free movement between the bones. They are characterized by the presence of a synovial cavity.

2. **Structure of Synovial Joints**:
- The two bones that form a synovial joint are separated by a synovial cavity, which is filled with synovial fluid.
- Synovial fluid serves as a lubricant, reducing friction between the bones during movement.
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