Distinguish between exocytosis and endocytosis.

Explanation

### Step-by-Step Solution:

1. **Definition of Exocytosis**:
- Exocytosis is the process by which materials are transported out of a cell. During this process, vesicles containing substances fuse with the cell membrane, releasing their contents outside the cell.

2. **Function of Exocytosis**:
- The primary function of exocytosis is to expel waste products or secretory materials (like hormones or enzymes) from the cell. This is essential for maintaining the cell's internal environment and for communication between cells.

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