CPU এবং Computer Device এর মধ্যে যোগাযোগে ব্যবহৃত হয় -

A control bus is what a computer’s central processing unit (CPU) uses to communicate with other devices inside the machine over a set of physical connections like cables or printed circuits. It is a diverse collection of signals, including read, write, and interrupt, that allow the CPU to direct and monitor what the different parts of the computer are doing. This is one of three types of buses that make up the system or computer bus. Its exact composition varies among processors.

source - quora.com