Loanword meaning 'contrast' — the difference or comparison between two or more things. In photography it refers to light/dark differences; in design, the visual contrast between elements; also used in general comparisons.
この写真はコントラストが強く、被写体が際立っている。
This photo has strong contrast and the subject stands out.
色のコントラストを意識してレイアウトを作った。
I created the layout with attention to color contrast.
二人の性格のコントラストが物語を面白くしている。
The contrast between the two characters' personalities makes the story interesting.