What is bitcoin?

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Just last night, I was gathered with a whole bunch of people for what was said an "income opportunity". I am looking for one which can really make a difference in the way my life has been going, not for me but for a special project I have in mind for my sons, especially the youngest. So anyway, back to my question. Can anyone please tell me if this is like a potential income generator? Is there anyone out there who is using this like how cash works? I wanna hear from those who really are users of this bitcoin stuff. Thank you all and have a good day.