Monochrome refers to images that consist of a single colour or shades of a single colour. In photography, it is most commonly used to describe black-and-white images, where tones range from black through grey to white, creating a classic and timeless aesthetic.
Monochrome can also refer to images rendered in variations of any single colour, not just black and white. This approach emphasizes texture, form, and contrast, making it a popular choice in fine art, portrait, and architectural photography where colour distraction is minimized and mood or detail is enhanced.