Just as on a busy highway, the tremendous volume of aircraft flying the skies today requires traffic management. Someone has to be in control of where all those aircraft are flying, at what altitude and speed, and by what route. The task falls to the various air traffic control agencies located in nearly every country around the world. Air traffic control is a vital component in the safety and economy of the nations of the world. Without a system to keep things moving safely, people and goods cannot be transported efficiently in a timely manner.
Please take this opportunity to read the Air Traffic Control articles in the Learning Center.
When you're familiar with ATC, return to here and click on the Fly This Lesson Now link to practice what you just learned.