Name the components of endoplasmic reticulum.

Explanation

### Step-by-Step Solution:

1. **Understanding Endoplasmic Reticulum (ER)**: The endoplasmic reticulum is a vital cell organelle involved in various cellular processes. It exists in two forms: Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).

2. **Identifying the Types**:
- **Rough Endoplasmic Reticulum (RER)**: Characterized by the presence of ribosomes on its surface, which are essential for protein synthesis.
- **Smooth Endoplasmic Reticulum (SER)**: Lacks ribosomes and is primarily involved in lipid synthesis.

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