Computer is a very useful device in the present world. Computer has become so popular that, sometimes it may be difficult to survive without computer!!. Computer is a store house of knowledge with the hep of internet. Computer has helped to develop many fields such as Medicine etc. and we use it in offices,homes,schools ,everywhere. Now we can say that computer has conquered the whole world!. We use it in our daily life ( for eg: we students), help to complete our project and it also helps in our studies a lot. Thus we need computer.