If you mean Binary Options, these are basically a bet, in which the "trader" receives a payout or loses their investment, based on if the price moves in their direction or the opposite direction. This must occur before the BO's expiry date. Its a win-all or lose-all proposition, so if you are wring by 1 pip, you still lose your stake. The BO firm decides what the price is, there's no right of appeal. Its basically gambling like on a fruit machine.
Binary Options have so often been offered by scam operators that they are illegal for offer to the general public in many countries, including the UK, the EU, Canada, Israel etc..