1. A list of instructions, written in a programming language, that a computer can execute so that the machine arts in a predetermined way. Synonymous with software. The world of computer programs can be divided into system programs, utility pograms, and application programs: * System programs include all the programs the computer requires to function effectively, including the operating system, memory management software, and command-line interpreters The MS-DOS operating system is an example of system software. * Utility programs include all the programs you can use to maintain the computer system. MS-DOS includes several utility programmed such as CHKDSK. Most users equip their systems with utility packages (such as Norton Utilities or PC Tools) that go beyond the basics that MS-DOS provides. * Application programs transform the computer into a tool for performing a specific kind of work, such as word processing, financial analysis (with an electronic spreadsheet), or desktop publishing. Additional software categories include programming languages, games, educational programs, and a variety of vertical market programs. See executable program, high-level programming language, and machine language. From QUECID

2. n. 1. A magic spell cast over a computer allowing it to turn one's input into error messages. 2. An exercise in experimental epistemology. 3. A form of art, ostensibly intended for the instruction of computers, which is nevertheless almost inevitably a failure if other programmers can't understand it. From Jargon Dictionary