Control Unit

This is a core part of the CPU, it tells everything in the computer what to do. it tells the memory, the input/output devices and more how to respond to a programs command. The Control Unit is sometimes known as "The brain within the brain"; this is because the CPU is the brain of the computer and the Control Unit controls most of the computer, like a human brain does with the body, and it is located inside the CPU.

The Control Unit converts input information into control signals, when you press a key on a keyboard it is converted to information that a program can use (presumably in machine code). This unit also controls what the attached hardware does, so if speakers are attached or a monitor is connected it tells them what to display or what sounds to play.