Definitions of footprint

the mark left on a surface by a person's bare foot, shoe or other footwear

The recent jury's statement included a reference to the footprint evidence as one indicator of guilt.

the shape of the foundation (=base) of a building

The footprint of the building has been enlarged to allow for an additional 12 apartments.

the effect that human activity has on the environment; the effect that something has on a geographical area or on an area of activity

This will reduce the transportation sector's environmental footprint by offsetting diesel fuel usage in compression ignition engines.