There are two broad categories of options. A call option represents the right to buy the underlying asset at the strike price, while a put option represents the right to sell the underlying asset at the strike price. Each option contract has an expiration date, or expiry, which is the date when the contract lapses. On a single underlying asset there can be many options trading with different strike prices and different expiries.
In an option trade, the party that buys the option contract enters in the long position and pays an option premium to the seller of the option (the option “writer”) who is in the short position. The writer of the option is obliged to fulfil his/her side of the contract when the option buyer decides to exercise the option. Options use leverage and the option contract multiplier defines how much of the underlying asset the option controls. For example, an option contract on a share typically has a multiplier of 100, meaning 1 option contract represents 100 shares of the underlying.
