Net Terms Platform In computer language, a platform is an underlying computer system on which programs can run. On personal computers, the two most popular platforms are the Windows 95 and Macintosh platforms. On larger computers such as mainframes, other platforms are sometimes used. A platform consists of an operating system (the computer's coordinating program) and a microprocessor (the microchip that performs logic operations and data management in your computer). The operating system must be designed to work with a particular microprocessor's set of instructions. For example, Windows 95 is built to work with microprocessors from Intel (and other companies) that share the same or similar sets of instructions. Historically, most applications have been written to run only on a particular platform. In other words, a program that was originally written to run on the Macintosh platform would have to be rewritten to function on the Windows platform. However, with the advent of new operating standards, some programs will be able to run on different platforms or to interoperate with different platforms simultaneously.