A binary option is a financial product where the buyer receives a payout or loses their investment, based on if the option expires in the money. Binary options depend on the outcome of a "yes or no" proposition, hence the name "binary." Binary options have an expiry date and/or time. At the time of expiry, the price of the underlying asset must be on the correct side of the strike price (based on the trade taken) for the trader to make a profit.
A binary option automatically exercises, meaning the gain or loss on the trade is automatically credited or debited to the trader's account when the option expires.
A binary option may be as simple as whether the share price of ABC will be above $25 on April 22, 2019, at 10:45 a.m. The trader makes a decision, either yes (it will be higher) or no (it will be lower).
Let’s say the trader thinks the price will be trading above $25, on that date and time, and is willing to bet $100 on it. If ABC shares trade above $25 at that date and time, the trader receives a payout per the terms agreed. For example, if the payout was 70%, the binary broker credits the trader's account with $70.
If the price trades below $25 at that date and time, the trader was wrong and loses their $100 investment in the trade.
Binary options occasionally trade on platforms regulated by the Securities and Exchange Commission (SEC) and other regulatory agencies, but most binary options trading occurs outside the United States and may not be regulated. Unregulated binary options brokers don’t have to meet a particular standard; therefore, investors should be wary of the potential for fraud. Conversely, vanilla options trade on regulated U.S. exchanges and are subject to greater oversight.