| HAL | Hardware Abstraction Layer |
| HAV | Hardware Assisted Virtualization |
| HCL | Hardware Compatibility List |
| HDCP | High-Bandwidth Digital Content Protection |
| HDD | Hard Disk Drive |
| HDMI | High Definition Media Interface |
| HIPS | Host Intrusion Prevention System |
| HPFS | High Performance File System |
| HTML | Hypertext Markup Language |
| HTPC | Home Theater PC |
| HTTP | Hypertext Transfer Protocol |
| HTTPS | Hypertext Transfer Protocol Secure |
| I/O | Input/Output |
| IaaS | Infrastructure as a Service |
| ICMP | Internet Control Message Protocol |
| ICR | Intelligent Character Recognition |
| IDE | Integrated Drive Electronics |
| IDS | Intrusion Detection System |
| IEEE | Institute of Electrical and Electronics Engineers |
| IIS | Internet Information Services |
| IMAP | Internet Mail Access Protocol |
| IMEI | International Mobile Equipment Identity |
| IMSI | International Mobile Subscriber Identity |
| IP | Internet Protocol |
| IPConfig | Internet Protocol Configuration |
| IPP | Internet Printing Protocol |
| IPS | Intrusion Prevention System |
| IPSec | Internet Protocol Security |
| IR | Infrared |
| IrDA | Infrared Data Association |
| IRP | Incident Response Plan |
| IRQ | Interrupt Request |
| ISA | Industry Standard Architecture |
| ISDN | Integrated Services Digital Network |
| ISO | International Organization for Standardization |
| ISP | Internet Service Provider |
| JBOD | Just a Bunch of Disks |
| KB | Knowledge Base |
| KVM | Kernel-based Virtual Machine |
| KVM | Keyboard-Video-Mouse |
| LAN | Local Area Network |
| LBA | Logical Block Addressing |
| LC | Lucent Connector |
| LCD | Liquid Crystal Display |
| LDAP | Lightweight Directory Access Protocol |
| LED | Light Emitting Diode |
| LPD/LPR | Line Printer Daemon/Line Printer Remote |
| LPT | Line Printer Terminal |
| LVD | Low Voltage Differential |
| MAC | Media Access Control/Mandatory Access Control |
| MAN | Metropolitan Area Network |
| MAPI | Messaging Application Programming Interface |
| mATX | Micro Advanced Technology Extended |
| MAU | Media Access Unit/Media Attachment Unit |
| MBR | Master Boot Record |
| MBSA | Microsoft Baseline Security Analyzer |
| MDM | Mobile Device Management |
| MFA | Multifactor Authentication |
| MFD | Multifunction Device |
| MFP | Multifunction Product |
| MicroDIMM | Micro Dual Inline Memory Module |
| MIDI | Musical Instrument Digital Interface |
| MIME | Multipurpose Internet Mail Extension |
| MIMO | Multiple Input Multiple Output |
| MMC | Microsoft Management Console |
| MP3 | Moving Picture Experts Group Layer 3 Audio |
| MP4 | Moving Picture Experts Group Layer 4 |
| MPEG | Moving Picture Experts Group |
| MSConfig | Microsoft Configuration |
| MSDS | Material Safety Data Sheet |
| MT-RJ | Mechanical Transfer Registered Jack |
| MUI | Multilingual User Interface |
| NaaS | Network as a Service |
| NAC | Network Access Control |
| NAS | Network-Attached Storage |
| NAT | Network Address Translation |
| NetBIOS | Networked Basic Input/Output System |
| NetBEUI | Networked Basic Input/Output System Extended User Interface |
| NFC | Near Field Communication |
| NFS | Network File System |
| NIC | Network Interface Card |
| NiCd | Nickel Cadmium |
| NiMH | Nickel Metal Hydride |
| NLX | New Low-profile Extended |
| NNTP | Network News Transfer Protocol |
| NTFS | New Technology File System |
| NTLDR | New Technology Loader |
| NTP | Network Time Protocol |
| NTSC | National Transmission Standards Committee |
| NVMe | Non-volatile Memory Express |
| OCR | Optical Character Recognition |
| OEM | Original Equipment Manufacturer |
| OLED | Organic Light Emitting Diode |
| OS | Operating System |
| PaaS | Platform as a Service |
| PAL | Phase Alternating Line |
| PAN | Personal Area Network |
| PAT | Port Address Translation |
| PC | Personal Computer |
| PCI | Peripheral Component Interconnect |
