The higher versions of the operating systems are so written that programs designed for earlier versions can still be run. What is it called?

The higher versions of the operating systems are so written that programs designed for earlier versions can still be run. What is it called? Correct Answer Upward compatibility

Refers to software that runs not only on the computer for which it was designed, but also on newer and more powerful models. For example, a program designed to run on an Intel 386 microprocessor, which also runs on a Pentium, is upward compatible. Upward compatibility is important because it means you can move to a newer, larger, and more sophisticated computer without converting your data.
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