A computer is a device capable of performing 100,000 operations per second, and even per second. Many consider the computer our future, so it is! Only thanks to such a device, we can move on and make incredible discoveries, such as: simulation of events with an accuracy of 99.99%, artificial intelligence, reach the far corners of our universe. But even such was found people who think that the computer is harm and I would like to tell them that using a computer in moderation does not harm health, but if you overdo it, of course the effect will not keep you waiting. People who think that the computer is an invention is useless, we need to know that without it we would not have the Internet, communications, pretty big technologies, satellites, robot assistants in deadly conditions for humans, and many other things can not be listed in lines. As a result, we realized that a computer-thing is necessary, but it also has its disadvantages.