Computer Software
For personal computers, the most popular operating systems are Microsoft’s Windows, Apple’s OS X, and different versions of Linux. Smartphones and tablets run operating systems as well, such as Apple’s iOS, Google’s Android, Microsoft’s Windows Mobile, and Blackberry. More and more frequently, the reason for connecting to a telecommunications network is to gain access to the resources of the Internet. Web browsers are rapidly becoming one of the most popular categories of software packages. A browseris a program that enables its user to access electronic documents in included in the Internet's World Wide Web, a collection of interlinked hypermedia databases distributed among remote sites. A “killer” application is one that becomes so essential that large numbers of people will buy a device just to run that application. For the personal computer, the killer application was the spreadsheet. In 1979, VisiCalc, the first personal-computer spreadsheet package, was introduced. It was