How do they work? How do you buy them? How do you transfer them? How do you trade them for cash? Does their value fluctuate like traditional currencies? Are their any risk to owning them? Is there a fraud risk?
There are seven (7) questions that the OP asks, if answered one by one, it may take a full page for the OP's questions.
For that briefly the answer to the OP's question, can be seen below.