Name the unit in which rainfall is measured.

Explanation

**Step-by-Step Solution:**

1. **Understanding Rainfall Measurement**: Rainfall is a significant aspect of weather and climate, and it is important to measure it accurately for various purposes, including agriculture, water resource management, and climate studies.

2. **Identifying the Unit of Measurement**: The unit in which rainfall is typically measured is millimeters (mm). This unit indicates the depth of water that would accumulate on a flat surface if all the rain fell at once.

3. **Alternative Measurement Unit**: In some contexts, rainfall can also be measured in inches, especially in countries that use the imperial system. However, the metric unit (millimeters) is more commonly used in scientific contexts.

...