What real blogging is all about?

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I am a bit confused what a real blogging is all about? some times people describe blogs as a diary, where one can write about his/her life. sometimes people say that blogging is about sharing things with other people. And there are people who mingle blogging with money making. What I feel is that blogging is among all these three things like.. It's a diary when u write something about ur life, It's sharing plateform where u can share ur mind with likeminded people, also u can share ur expertise with others as well..and Third is..If there are chances of making some money with it..WHY NOT... But still not able to get real definition of blogging...can anyone tell me plz...........