What is IUI? When is this technique used?

Explanation

### Step-by-Step Solution

1. **Definition of IUI**:
- IUI stands for Intrauterine Insemination. It is a medical procedure used to treat infertility by directly placing sperm into a woman's uterus.

2. **Purpose of IUI**:
- The primary purpose of IUI is to assist couples who are having difficulty conceiving naturally. Infertility is defined as the inability of a couple to conceive after trying for a certain period.

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