Introduction to Computers Use these interactive games to reinforce terms for this unit. Tools A B URL uniform resource locator, address http hypertext transfer protocol domain name identifies web site web server computer that delivers (serves) web pages www world wide web hyperlink built in connections on web page web site collection of related web pages ISP internet service provider, supplies connection to web for monthly fee LAN local area network, connects computers in limited geographical area WAN wide area network, covers a large geographical area html hypertext mark-up language GUI graphical user interface, user friendly screen OS operating system, set of computer instructions input allows user to enter data, commands or programs into computer primary input devices keyboard, mouse memory any data to beprocessed must be stored here auxiliary memory secondary storage storage devices floppy, hard disk, compact disc CPU central processing unit Control unit interprets instructions Arthmetic/Logic unit performs mathematical and logical processes Output devices makes processed information available for use formatting preparing disk for reading & writing track full circle recording band sector pie-shaped section, breaks tracks into small areas kilobyte 1000 memory bytes megabyte 1 million memory bytes gigabyte 1 billion memory bytes system software controls operations of computer equipment booting loading operating system into memory application software programs that tell computer how to process information network collection of connected computers Internet links millions of computers www contains billions of web pages web browser software needed to view pages on web Information processing cycle input, process, output, storage virus program or peice of code loaded onto your computer without your knowledge supercomputers fastest, channels power into executing few programs as fast as possible mainframes uses its power to run many programs concurrently, can support hundreds-thousands of users microcomputers relatively small, inexpensive computer designed for individual user microprocessor silicon chip that contains a CPU ARPANET established in 1969 by US Defense Department