What is "abandonware"

n. (context computing chiefly video games English): A software product, especially a video game, whose copyright is no longer defended or which is no longer marketed even by the company who made it.

Abandonware is a product, typically software, ignored by its owner and manufacturer, and for which no product support is available. Although such software is usually still under copyright, the owner may not be tracking or enforcing copyright violations.

In intellectual rights context, abandonware is a software (or hardware) special case of the general concept of orphan works.