An application that creates a mass market for an emerging technology. First used to describe VisiCalc and Lotus 1-2-3 in the early 1980s after it became evident that demand for the spreadsheet had been the catalyst for the sale of IBM PCs in the enterprise. Netscape was once described as the Internet’s killer app.
n. 1. An application of such popularity and widespread standardization that it fuels sales of the hardware platform or operating system for which it was written. See also application. 2. An application that supplants its competition. See also application.