• CAD Computer-Aided Design
• CADD Computer-Aided Design and Drafting
• CADE Computer-Aided Document Engineering
• CAE Computer-Aided Engineering
• CAI Computer-Aided Instruction
• CALS Computer-aided Acquisition and Logistic Support / Continuous Acquisition and Lifecycle Support
• CAM Computer-Aided Manufacturing / Common Access Method
• CAN Campus Area Network
• CARL Colorado Alliance of Research Libraries
• CAS Communications Application Specification
• CASE Computer-Aided Systems Engineering / Computer-Aided Software Engineering
• CAT Computer Adaptive Testing
• CATV CAble TeleVision
• CAVE Cave Automatic Virtual Environment
• CB Create Button / Citizen's Band
• CBB Change Button Binding
• CBE Computer-Based Education
• CBET Computer Based Education and Training
• CBIOS Compatibility BIOS
• CBM Commodore Business Machines
• CBT Computer-Based Training
• CCD Charge-Coupled Device / Charge-Coupled Diode
• CCIRN Coordinating Committee for Intercontinental Research Networks
• CCIS Common Channel Interoffice Signaling
• CCITT Comite Consultatif International de Telegraphique et Telephonique
• CCL Connection Control Language
• CCR Commitment, Concurrency and Recovery
• CCS Common Command Set
• CD Compact Disk / Change Directory / Carrier Detect
• CD-I Compact Disk Interactive
• CD-R Compact Disk Recordable
• CD-ROM Compact Disk Read Only Memory
• CDE Common Desktop Environment
• Cdev Control Panel DEVice
• CDK Control Development Kit
• CDMA Code Division Multiple Access
• CDPU Cellular Digital Packet Data
• CDR Constant Density Recording
• CERT Computer Emergency Response Team
• CES Consumer Electronics Show
• CFR Computerized Facial Recognition
• CFV Call For Votes
• CGA Color Graphics Adapter
• CGI Common Gateway Interface
• CGM Computer Graphics Metafile
• CI Check Item
• CIB Change Item Binding
• CICS Customer Information Communication System
• CIE Commercial Internet Exchange / Commission Internationale de l'Eclairage
• CIM CompuServe Information Manager
• CIS Card Information Structure / Compuserve Information Service
• CISC Complex Instruction Set Computer
• CIX Commercial Internet EXchange
• CLASS Custom Local-Area Signaling Services
• CLC Color Laser Copier
• CLI Call-Level Interface
• CLNS ConnectionLess Network Services / ConnectionLess-mode Network Services
• CLTP ConnectionLess Transport Protocol
• CMC Common Messaging Calls
• CMIP Common Management Information Protocol
• CMIS Common Management Information Services
• CMOL CMIP On IEEE 802.2 Logical Link Control
• CMOS Complementary Metal Oxide Semiconductor
• CMOT Common Management Information Protocol Over TCP/IP
• CMS Conversational Monitor System
• CMY Cyan Magenta Yellow
• CMYK Cyan Magenta Yellow BlacK
• CNI Coalition for Networked Information
• CNIDR Clearinghouse for Networked Information Discovery and Retrieval
• COBOL COmmon Business Oriented Language
• CODE Client/server Open Development Environment
• CODEC COmpression DECompression
• COM Common Object Model
• CONS COnnection-mode Network Services
• CORBA Common Object Request Broker Architecture
• COS Corporation for Open Systems
• CoSN Consortium for School Networking
• CP/M Control Program for Microcomputers
• CPE Customer Premises Equipment / Convergence Protocol Entity
• CPN Compuserve Packet Network
• CPR Computerized Patient Records
• CPS Cycles Per Second
• CPU Central Processing Unit
• CRC Cyclic Redundancy Check / Computer Records Center
• CREN Corporation for Research and Networking
• CRS Configuration Report Server
• CRT Cathode Ray Tube
• CS Clear to Send
• CSD Computer Services Organization
• CSLIP Compressed Serial Line Internet Protocol
• CSMA/CD Carrier-Sense Multiple-Access/Collision-Detect(ion)
• CSNET Computer+Science NETwork
• CSU Channel Service Unit
• CSU/DSU Channel Service Unit/Data Service Unit / Channel Service Unit/Digital Service Unit
• CSV Comma-Separated Values
• CTB Communications ToolBox
• CTERM Communications TERMinal Protocol / Command TERMinal Protocol
• CTI Computer/Telephony Interconnect
• CTS Carpal Tunnel Syndrome / Clear To Send
• CUA Common User Access
• CUI Common User Interface
• CWIS Campus Wide Information System