What's the most important invention?

Day after day, our life is more and more convenient and modern. We think about new things and create them to serve us. Therefore, many new inventions are born every years from over the world such as cellphones,television,electric lamp, robots and etc. All is important and in my opinion, the most prominent invention today is computer.
The first, computer can store a huge mount of information that people can not.For example, if you are a secretary,how you can remember everything in your company from profile of your boss to employee's profile? Computer can remember for you. And when your boss ask you, you just have to click and print.So your job will be easier.In addition, you can find information about anything you want to know from over the world.
The second, computer help us work,study and do many thing without going out. We can stay at home and do what we want. We can find information for working online, we also learn at home by teacing online programs. It's very useful because many people can't go out their home but they still communicate with society. For example, house wife is busy because she has to do house works and takes care of her children. She can shopping but still care of her family with shopping online, such as old people that is too old to go out, they also can buy something for them withou make their family annoyed.