I have revised my essay, please take a look. Thanks.

Computers now play an essential role in our society. Some people think that the computer is the most important invention of the last century. While others think other inventions are of more importance. The essay supports the former argument. Firstly, the essay will show how the computer simplifies our life and secondly, discuss how it eliminates manual work.

Computers have made our life more convenient than years ago in many aspects. Customers use shopping websites or smartphone applications to buy whatever they want online. Browsing goods on the computer is much easier than driving to the shopping mall. Many young people do not know how to cook a meal. Ordering meals on the computer is an alternative. Years ago, we communicated with each other through letters. We had to wait for several days or even months before our friends received our letters. Now we use instant messager like Facebook, Wechat.

People created the computer in the purpose of dealing with complex calculations. Calculating is a tiring and complicated job. People often make mistakes doing such a job all day. Computers free us from annoying calculation problems. After years of development, computers can do more complex things now. Computers can control machines to produce goods without human guidance. Besides, advanced techniques like image recognition and automatic driving are running on computers. Computers can complete lost of tasks used to be done by the human.

In conclusion, the computer has made our life convenient and reduced lots of manual tasks. There is no doubt that the computer is the most important invention in the last 100 years.