A more thorough explanation:

Definition: A footprint is the mark left on a surface, such as soil or snow, by a person's foot or a shoe.

For example, when a detective is investigating a crime scene, they may look for footprints in the soil or snow to determine who was present at the scene. In real estate, a building's footprint refers to the shape of its base, which can affect its size and layout.

These examples illustrate how a footprint can provide evidence or information about a person or object's presence or characteristics.