A computer uses software, colloquially known as programs and applications, to perform tasks. The computer accesses its commands from the operating instructions in the software and then performs the tasks specified in these instructions. Computer users can purchase a host of software, including word processors, graphic editors, databases, games, and more. Software has to be compatible with a computer operating system, such as Windows, Mac OS, and Linux. A computer becomes unusable if it does not have software installed onto it. An operating system typically has software programs already installed onto it. In addition, numerous software programs can be found online totally free of charge.
A personal computer (PC) can eliminate the clutter sitting around the house. A computer has an electronic phone book, calendar, notepad, address book, daily planner, files, and folders. The latter two replaces manilla folders and filing cabinets, huge space wasters in any environment. People can use their computers to watch television and DVDs. Computers can play recorded music and streaming live audio. Computer technology has rapidly advanced to the point where people can upload entire photo albums, send electronic mail, and make long distance calls at the same time. More importantly, computer technology has increased its user-friendliness, making it easily accessible for those limited by mental and physical constraints. 
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