A wire harness, also known as a wire harness or cable assembly, is a set of cables or wires aligned to provide efficient transmission of information or electronic signals. The number of wires included in the harness will depend on the intended purpose of the wiring and the amount of current or data that must be transmitted to complete basic tasks.

Typically, some method is used to secure the cables in position, which helps prevent problems that could interfere with the normal function of the cables.

A harness can be used in any number of different devices that rely on the use of electric current for operation. For example, it is not unusual to find this type of wiring harness used in many vehicle engines. Bundling the cables makes it possible to transfer power to different engine components, which helps to support the overall operation of the engine with high efficiency. In this application, the cables in the harness are usually protected by some form of sheath and secured in place with clamps to minimize the risk of damage to the cables during normal operation.