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Collection of compiled routines that other programs can use

Perform a specific computer-related task

Translates programming language into machine code that can be executed by a computer

translate assembly language programs into machine code

translates the source code high-level language into object code

analyse and execute each line of a program independently

Many users, many tasks (e.g. word processor)

Many users, one task (e.g. web browser)

One user, one task (e.g. air traffic control)