The glossary below contains many of the terms you will find in common use throughout our website. Please refer to this list to find definitions of terms and answers to other Internet security-related questions.


A group of wires that are enclosed in a protective tube. Usually this is an organized set of wires that correspond to specific pins on a 9- or 25-pin connector located at each end. A cable is used to connect peripheral devices to each other or to another computer. In remote computing, this can refer to a cable that is used to connect a computer to a modem, or a cable that connects two computers directly, which is sometimes called a null modem cable.