Specialized written coded commands that specifically tell a computer what tasks to perform. These may be operating instructions for specific task-based applications. The computer then processes and carries out these instructions, performing a wide range of tasks that include image editing, word processing, managing databases, creating music, and so forth. These are generally called “programs.” Additional procedures, rules, and complex instructions that govern the overall performance and user interface of a computer (or any other hardware) are called operating systems (or OS).