The definition of monochrome is an image displaying a single colour or different shades of a single colour. The entire image is recorded and represented by differing amounts of light instead of dissimilar hues. Black and White (B&W) photography is the most prominent example of Monochrome Photography, as it represents subjects in varying shades of neutral grey but includes no other colours. 

Monochrome Photography imagery stands in stark contrast to contemporary colour photography. Due to this distinction, B&W images are not true renditions of the world, but rather abstractions that represent different colours with unalike shades of the same colour. Because of this, Monochrome Photography is most often used for artistic and aesthetic purposes.