Difference engines were early mechanical computers designed to calculate polynomial functions.

Difference equations are used to model dynamic systems.

The difference gates are used to control the flow of traffic.

Finite differences are used to approximate derivatives in numerical analysis.

The mass differences between the two objects are significant.

There are potential differences between the two theories.

The symmetric differences between the two sets are the elements that are in one set or the other, but not in both.

The time differences between New York and Tokyo can be quite significant.

She makes a difference in the lives of others.

She made a difference in the lives of many children.