Name two types of ER

Explanation

**Step-by-Step Text Solution:**

1. **Understand the Concept of Endoplasmic Reticulum (ER):**
- The endoplasmic reticulum (ER) is a network of tiny tubular structures found in the cytoplasm of eukaryotic cells. It plays a crucial role in the synthesis and transport of proteins and lipids.

2. **Identify the Basis of Classification:**
- The ER can be classified into two types based on the presence or absence of ribosomes on its surface. Ribosomes are the cellular structures responsible for protein synthesis.

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