Actually is a newbie and op needed to ask a question to know what he does not know of bitcoin, and secondly he did not make a research towards Bitcoin before posting, To know understand bitcoin is very easy,except that he or she didn't make out chance or time to research of how bitcoin works, its obvious that everything about bitcoin is online, even books and tutorial class on Internet can give a beginner more clue to understand exactly what bitcoin is all about, I could remember vividly that some years back, theirs a recommendable thread made in this community by a forum user that emphasize on the books that we can read to know about Bitcoin, so for some of us who is not familiar with bitcoin can search for such kinds of threads and read up of bitcoin, only thing it will take is a time.