How this different to normal Forex?
In the same way that you can lease cars, houses and boats, option contracts allow you to lease stock, futures or currency pairs (forex).
In the normal world, if you lease/rent a house and the property value goes down/up, that aint got shyt to do with you because you don't own the house. In the financial world though, option contracts allow you to still make/lose $$$, even as a participant who doesn't own the stock. It would be like renting a house but being paid $$$ if the house's value increase.
Buying an Apple options contract means that you are leasing 100 shares of Apple, and if Apple's price goes up, you can still make profits even as someone who doesn't actually own Apple shares.