What is the working principle of computer?? But CPU is not the one can you plz tell the answer??

to assist in functioning overall activities of computer

It's working principle is based on logical functions and arithmetic

professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).