 |  |  |
| CA | Certificate Authority | 证书权威 |
| CAD | Computer Aided Design | 电脑辅助设计 |
| CAI | Computer Aided Instruction | 电脑辅助教学 |
| CAM | Computer Aided Manufacturing | 电脑辅助制造 |
| CASE | Compter Aided Software Engineering | 电脑辅助软件工程 |
| CAT | Computer Aided Testing | 电脑辅助测试 |
| CBT | Computer-Based Training | 基于电脑的训练 |
| CC | Courtesy Copy | (电子邮件)副本 |
| CCCII | Chinese Character Code for Information Interchange | 汉字信息交换码 |
| CCITT | Consultative Committee for International Telegraph and Telephone | 国际电报电话咨询委员会 |
| CD | Carrier Detect | 资料载波侦测 |
| | Compact Disc | 光盘 |
| CDDI | Copper Distributed Data Interface | 铜缆分布式数据接口 |
| CD-E | Compact Disc - Erasable | 可擦除光盘 |
| CD-I | Compact Disc - Interactive | 互动式光盘 |
| CD-R | Compact Disc - Recordable | 可写光盘 |
| CD-ROM | Compact Disc - Read Only Memory | 只读光盘 |
| CD-RW | Compact Disc - ReWritable | 可擦写光盘 |
| CERN | European Laboratory for Particle Physics | 欧洲粒子物理实验室(CERN为法文缩写) |
| CERT | Computer Emergency Response Team | 计算机紧急情况反应小组 |
| CGI | Common Gateway Interface | 通用网关界面 |
| | Computer Graphic Interface | 计算机图形接口 |
| CIM | CompuServe Information Manager | (一种CompuServe的图形界面程序) |
| | Computer Input Microfilm | 电脑输入缩微胶卷 |
| CISC | Complex Instruction Set Computer | 复杂指令集计算机 |
| CIX | Commercial Internet Exchange | 商业因特网交换中心(连接点) |
| CJK | China Japan Korea | 中国、日本、韩国(三国联合制定的中文字符标准) |
| CMI | Computer Managed Instruction | 电脑管理教学 |
| CMOS | Complementary Metal Oxide Semiconductor | 互补金属氧化物半导体 |
| CMYK | Cyan Magenta Yellow Black | 青色、洋红、黄色、黑色 |
| COA | Certificate Of Authenticity | 真品证书 |
| COM | Component Object Model | 组建对象模型 |
| cps | characters per second | 字符每秒钟 |
| CPU | Central Processing Unit | 中央处理器 |
| CRC | Cyclical Redundancy Check | 循环冗余检验 |
| CREN | Corporation for Research and Educational Networking | 研究与教学连网组织 |
| CSCW | Computer Supported Cooperative Work | 电脑支持的协同工作 |
| CSNet | Community Service Nerwork | 社区服务网络 |
| CSNET | Computer and Science Network | 计算机与科学网络 |
| CSO | Computing Services Office | 计算机服务机构 |
| CSS | Cascading Style Sheets | 级联样式表 |
| CTI | Computer Telephony Integration | 电脑电话集成 |
| CTS | Clear To Send | 清除发送 |