Give one major difference between an insect and a spider.

Explanation

**Step-by-Step Solution:**

1. **Definition of Insects and Spiders:**
- Insects are a class of arthropods characterized by having three pairs of legs, which totals to six legs. Their body is divided into three distinct parts: head, thorax, and abdomen.
- Spiders, on the other hand, belong to a different class of arthropods known as arachnids. They are characterized by having four pairs of legs, which totals to eight legs. Their body is divided into two main parts: the cephalothorax (which is a fusion of the head and thorax) and the abdomen.

2. **Major Difference:**
- The most significant difference between insects and spiders is the number of legs they possess. Insects have six legs (three pairs), while spiders have eight legs (four pairs).
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