Computer network. I suppose that a computer is a useful invention in the modern world, since the computer helps children in their studies. For example, students often look for information on the Internet. The Internet is a computer. Besides, it saves time for them. Also teachers often ask their homework using a computer. There is another point of view that computer networks are bad, because the computer harms your eyes. Besides, the Internet has a lot of unnecessary information for children. Thus, computer networks have advantages and disadvantages, but I believe that computer networks are good.