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Well, from my point of view. to interact to other people by way of technology. :)
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Try living without it and you'll soon know! ;)
Many important things such as word processing, communication via internet, desktop publishing, e-learning, business, gathering information, games, music and many more.
Your question is so silly.
Its best answer is to ask from own-self.
Well for a bookish answers you can follow any book's article.
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