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The PC Glossary

Definitions of Computer and Internet Terms

Computer Terms Beginning with "I"

I/O Stands for "Input/Output" and is pronounced simply "eye-oh." Computers are based on the fundamental idea that every...
I/O Address Each I/O device connected to your computer is mapped to a unique I/O (Input/Output) address. These addresses are...
IBM Compatible The personal computer market in the early 1980's consisted primarily of Apple and IBM computers. Apple's systems ran a...
ICANN Stands for "Internet Corporation For Assigned Names and Numbers." The ICANN is an non-profit corporation that is...
ICF Stands for "Internet Connection Firewall." ICF is a Windows XP feature that protects computers connected to the...
ICMP Stands for "Internet Control Message Protocol." When information is transferred over the Internet, computer systems...
Icon Ever since the Macintosh was introduced in 1984, icons have been the way we view files on computers. An icon on your...
ICQ ICQ is a popular online chat program that allows users to communicate with each other over the Internet. It is similar...
ICS Stands for "Internet Connection Sharing." ICS allows multiple computers to connect to the Internet using the same...
ICT ICT is short for "Information and Communication Technologies." It is similar to IT (Information Technology), but...
IDE IDE may either stand for "Integrated Device Electronics" or "Integrated Development Environment." The first is a...
IEEE Stands for the "Institute of Electrical and Electronics Engineers." This is a non-profit organization that develops...
IGP Stands for "Integrated Graphics Processor." An IGP is a graphics chip that is integrated into a computer's...
Illegal Operation When a program on your computer has an error, you may see a message pop up on the screen saying, "Illegal Operation...
IM Stands for "Instant Message." Instant messaging, or "IMing," as frequent users call it, has become a popular way to...
IMAP Stands for "Internet Message Access Protocol" and is pronounced "eye-map." It is a method of accessing e-mail messages...
Impact Printer An impact printer is a printer that strikes a print head against an ink ribbon to mark the paper. Common examples...
Impression It is said that you never get a second chance to make a first impression. Well, in the wonderful world of the World...
Inbox An inbox is the main folder that your incoming mail gets stored in. Whether you check your mail through a webmail...
Index An index is a list of data, such as group of files or database entries. It is typically saved in a plain text format...
Infotainment Infotainment is a combo word, like "fantabulous," that combines two words into one. It refers to television shows...
Inkjet Inkjet printers are the most common type of consumer printers. The inkjet technology works by spraying very fine drops...
Input Whenever you enter data into your computer, it is referred to as input. This can be text typed in a word processing...
Input Device An input device is any device that provides input to a computer. There are dozens of possible input devices, but the...
Install Most software programs require that you first install them on your computer before using them. For example, if you buy...
Installer In order to install new software on your computer, you often need to run an installer program. This program unpacks...
Integer An integer is a whole number (not a fraction) that can be positive, negative, or zero. Therefore, the numbers...
Integrated Circuit An integrated circuit, or IC, is small chip that can function as an amplifier, oscillator, timer, microprocessor, or...
Intellectual Property Intellectual property refers to the ownership of intangible and non-physical goods. This includes ideas, names...
Interface An interface is a port on a hardware device that allows it to connect to another device. Common hardware interfaces...
Interlaced A common way to compress video is to interlace it. Each frame of an interlaced video signal shows every other...
Internal Hard Drive As the name implies, an internal hard drive is a hard drive located inside a computer. Nearly all computers come with...
Internet Believe it or not, the Internet was created way back in 1969, during the Cold War, by the United States military. It...
InterNIC Stands for "Internet Network Information Center." The InterNIC is an organization created by the National Science...
Intranet Contrary to popular belief, this is not simply a misspelling of "Internet." "Intra" means "internal" or "within," so...
iOS iOS (pronounced "eye-oh-es") is Apple's mobile (operating system|operating_system) that runs on the iPhone, iPad, and...
IP Stands for "Internet Protocol." It provides a standard set of rules for sending and receiving data through the...
IP Address Also known as an "IP number" or simply an "IP," this is a code made up of numbers separated by three dots that...
iPad The iPad is a lightweight tablet PC developed by Apple. It looks similar to an iPhone, but has a much larger...
iPhone Apple's iPhone is a smartphone that functions as a mobile phone, an iPod, and can run third-party apps. It runs the...
iPod The iPod is a portable music player developed by Apple Computer. Though it is an Apple product, the iPod can be used...
IPv4 IPv4 is the fourth revision of the Internet Protocol and is the most common version used today. It uses 32-bit...
IPv6 Every computer system and device connected to the Internet is located by an IP address. The current system of...
IPX Stands for "Internetwork Packet Exchange." (I didn't know "exchange" started with an "x" either.) It is a networking...
IRC Stands for "Internet Relay Chat." IRC makes it possible for people using the Internet to converse with each other in...
IRQ Stands for "Interrupt Request." PCs use interrupt requests to manage various hardware operations. Devices such as...
ISA Stands for "Industry Standard Architecture." ISA is a type of bus used in PCs for adding expansion cards. For example...
iSCSI Stands for "Internet Small Computer Systems Interface." iSCSI is an extension of the standard SCSI storage interface...
ISDN Stands for "Integrated Services Digital Network." No, it's not the same thing as the ISBN you see in books. ISDN is a...
ISO Stands for "International Organization for Standardization." Yes, technically the acronym should be "IOFS," but I...
ISP Stands for "Internet Service Provider." In order to connect to the Internet, you need an ISP. It is the company that...
IT Stands for "Information Technology," and is pronounced "I.T." It refers to anything related to computing technology...
Iteration Iteration is the repetition of a function or process in a computer program. Iterations of functions are common in...
iTunes iTunes is an audio playback program developed by Apple Computer. You can use iTunes to import songs from CDs as well...
IVR Stands for "Interactive Voice Response." IVR is a telephony technology that can read a combination of touch tone and...

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