Options are a type of derivative product that allow investors to speculate on or hedge against the volatility of an underlying stock. Options are divided into call options, which allow buyers to profit if the price of the stock increases, and put options, in which the buyer profits if the price of the stock declines. Investors can also go short an option by selling them to other investors. Shorting (or selling) a call option would therefore mean profiting if the underlying stock declines while selling a put option would mean profiting if the stock increases in value.