Define the term "Promoters".

Explanation

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

1. **Definition of Promoters:**
A promoter is a substance that is added to a catalyst in a chemical reaction to enhance its effectiveness or performance.

2. **Characteristics of Promoters:**
- Promoters themselves do not have significant catalytic activity. This means that on their own, they do not cause or accelerate a chemical reaction.
- Their primary role is to improve the performance of the catalyst they are associated with.
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