Natural gas is bought and sold every day for delivery to energy companies that supply gas to the public. But most traders don't want to take delivery of actual gas. Brokers such as Plus500, offer natural gas to traders as a CFD, in which you can take a position on a real gas contract depending on whether you think the price of the underlying commodity is going to rise or fall before the contract expires. Your position is actually on a dated contract, for example "Natural Gas Jun-17".