What are vitamins ? How are they classified ?

Explanation

### Step-by-Step Solution:

**Step 1: Definition of Vitamins**
Vitamins are organic compounds that are essential for the normal growth and functioning of the body. They are required in small quantities and play crucial roles in various biochemical processes. Vitamins cannot be synthesized in sufficient amounts by the body and must be obtained from the diet.

**Step 2: Classification of Vitamins**
Vitamins can be classified into two main categories based on their solubility:

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