Delta (differencing)

Δέλτα (delta) is a letter of the Greek alphabet (Δ or δ). Delta differencing is a way of storing or transmitting file differences rather than complete files. Deltas, for example, are the changes after a full backup. The differences are stored in files called deltas. As a backup approach saves bandwidth, reduces redundancy and storage. You can also find deltas on the deployment process of an application that requires database changes.