A popular spreadsheet for Windows and OS/2, which is part of the IBM Lotus SmartSuite package. 1-2-3 was introduced for DOS in 1983 and later ported to many other platforms, including minis and mainframes.

The 1-2-3 name was chosen because it integrated spreadsheet, database and graphics. It was the first innovative spreadsheet for the PC and was launched with a superior marketing campaign. Its ability to function like a simple database was unique, and turning data into a chart with a single keystroke was dazzling for its time. The Lotus macro language was the first to be widely used in a spreadsheet. It has since been supplemented with LotusScript, a BASIC-like language that supports Notes manipulation.