Today, that technology system has play an part indispensable part. There is variety technology things established by human beings. such as telephone, air conditioners and cars, and these things act in in important roles in our life. before, people just had to mail a letter to each other as a way to communicated, because at that time we have moved in to the most important stature in the world. When I studied in primary school, the teacher told us that the first computer was established in American, its size was as big as three classrooms. On the other hand, the technology has given us a lot of convenience. Because of the computer, we do not have to send a little anymore, expect sometimes when we need to send a letter. Moreover, people can use the computer to study from the internet At the same time, people can keep touch with their parents or friends on the internet by the computer. As a result, since the technology was established, people have lived in a different world.