The following terms starting with the letter "I" have specific pages dedicated to them. You can come back to this page or the main Computer Terms page by using the navigation breadcrumbs at the bottom of each page.

• I/O = Input/Output
• IAB = Internet Architecture Board
• IAC = Internet Access Coalition
• IAD = Integrated Access Device
• IAHC = Internet International Ad Hoc Committee
• IANA = Internet Assigned Numbers Authority
• IANAL = I Am Not A Lawyer
• IAS = Internet Authentication Service
• IBM = International Business Machines
• IBM 1401 = Second-generation IBM mainframe
• IBM 650 = First successful IBM mainframe
• ICA = Independent Computing Architecture
• ICANN = The Internet Corporation for Assigned Names and Numbers
• ICMP = Internet Control Message Protocol
• Icon = A form of on-screen graphic
• ICQ = [No specific expansion]
• IDE = Intelligent (Integrated) Drive Electronics
• IDEA = International Data Encryption Algorithm
• IDSL = ISDN Digital Subscriber Line
• IEEE = Institute of Electrical and Electronics Engineers
• IETF = Internet Engineering Task Force
• IGES = Initial Graphics Exchange Specification
• IGMP = Internet Group Management Protocol
• IIM = Internet Interaction Management
• IIOP = Internet Inter-ORB Protocol
• IIS = Internet Information Server
• IMAP = Internet Message Access Protocol
• IMHO = In My Humble Opinion
• Impact Printer = Uses a character image to press against a ribbon
• Incremental Backup = A backup of only files that have changed
• Indent = A movement inward from the left or right margin
• Index = A pointer to data
• Input = Method of getting data into a computer
• Insert Mode = Entered text pushes existing to the right
• Integer = Number with no decimal places
• Intel 80x Processors = Description of early Intel CPUs
• Interleave Factor = Number of sectors skipped between write operations
• InterNIC = Internet Network Information Center
• Interpreter = A form of program used to run other programs
• Interrupt = Signal that stops some operation
• IOS = Input Output System
• IP = Internet Protocol
• IPSec = Internet Protocol Security
• IPTV = Internet Protocol Television
• IPX = Internetwork Packet Exchange
• IRC = Internet Relay Chat
• IrDA = Infrared Data Association
• IRQ = Interrupt Request
• ISA = Industry Standard Architecture
• ISAM = Indexed Sequential Access Method
• ISAPI = Internet Server API
• ISDN = Integrated Services Digital Network
• ISO = International Organization for Standardization
• ISP = Internet Service Provider
• ITU = International Telecommunications Union
• IX = Internet Exchange