A computer does not need to access the internet in order to run properly.
The internet is a way of connecting to other computer users. You can connect to the internet using a phone line, a cable connection, or by using a wireless connecting device (wi-fi). For most home computer users, this is a paid service, though you can use the Internet for free in some public locations, like the library or a coffee shop.
A computer will be able to perform most common functions (play music, type documents, edit pictures) and run programs without an internet connection. However, to view a web page or send an email, you will need an internet connection.
A computer needs an Operating System in order to work, though any new computer that you purchase will come with an operating system already installed. The most common operating systems are Microsoft Windows and Macintosh OS X.
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