To display the contents of the computer's hard drive. Without a monitor, you could still type on the keyboard and use the mouse, and the same things would happen to the data on the hard drive. You just wouldn't be able to see it!
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A computer has a screen to show the features of the interfacing you are using. It is an essential device for home-computing as without it there would be no way of viewing documents and searches.
because if the screens were small then you will be so close that your nose will touchin the computer also it can mess up your eye vision for being so close
So more people will buy it! And why not have a big screen? Apple wants to make more money. Anyways, The bigger the better!