Final answer:
A floodplain is a flat area susceptible to flooding near water bodies, favored for its rich, fertile soils that support agriculture and easy access to water.
Step-by-step explanation:
A floodplain is a flat area adjacent to a river or stream that is prone to flooding. One of the main reasons why people like to live on floodplains is because of the rich soil present, which is highly fertile and ideal for agriculture. The sediment deposited by floods creates soil that's nourishing for a variety of crops, supporting agricultural productivity. Additionally, floodplains may offer easy access to a water source for both personal and crop use. Historical settlements have flourished in these areas due to the ability to maintain a stable food supply.