What is synovial joint? With the help of one example for each, point out the difference between a ball and socket joint, and a pivot joint.

Explanation

### Step-by-Step Solution:

1. **Definition of Synovial Joint**:
A synovial joint is a type of joint found between bones that allows for free movement. These joints are characterized by a synovial cavity filled with synovial fluid, which lubricates the joint and reduces friction during movement.

2. **Characteristics of Synovial Joints**:
- Freely movable
- Contains synovial cavity
...