What is bioreactor?

Explanation

**Step-by-Step Solution:**

1. **Definition of Bioreactor**: A bioreactor is a vessel or container that provides a controlled environment for biological reactions to occur.

2. **Function of Bioreactors**: The primary function of a bioreactor is to facilitate the conversion of raw materials into specific products through the action of microorganisms.

3. **Examples of Microbial Action**: Microorganisms, such as bacteria and yeast, are often used in bioreactors. For instance, Lactobacillus bacteria convert milk into curd, while yeast can convert starch into ethanol (alcohol).

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