Ball-and-Socket joint and hinge joint

Explanation

### Step-by-Step Solution

1. **Definition of Synovial Joints**:
- Both ball-and-socket joints and hinge joints are types of synovial joints, which are characterized by a fluid-filled joint cavity that allows for a wide range of motion.

2. **Ball-and-Socket Joint**:
- **Structure**: In a ball-and-socket joint, the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone.
- **Movement**: This type of joint allows for movement around an indefinite number of axes, meaning it can rotate in multiple directions.
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