What is an explant?

Explanation

### Step-by-Step Solution:

1. **Definition of Explant**: An explant is defined as a small part or piece of tissue that is taken from a plant or animal for the purpose of culturing.

2. **Characteristics of Explant**: The explant must be disease-free. This is crucial to ensure that the culture process is not affected by any pathogens that could compromise the growth or health of the tissue.

3. **Purpose of Explant**: The purpose of using an explant is to grow specific types of cells or tissues. This can be for research, propagation, or other applications in biotechnology.

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