Online gambling, also known as Internet gambling, is a general term for gambling using the Internet. Contents. [hide]. 1 History; 2 Forms. Poker; Casinos History · Forms · Funds transfers · Legal status. Online gambling has grown in popularity since the first site opened 10 years ago. Find out how online gambling works and what online gambling games are. Rankings of the best online gambling sites for real money by category. Read our top rated site reviews to ensure a safe and reliable gambling experience.