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Options are financial instruments that convey the right, but not the obligation, to engage in a future transaction on some underlying security. For example, buying a call option provides the right to buy a specified amount of a security at a set strike price at some time on or before expiration, while buying a put option provides the right to sell. Upon the option holder's choice to exercise the option, the party that sold, or wrote, the option must fulfill the terms of the contract.[1]
The theoretical value of an option can be determined by a variety of techniques, including the use of sophisticated option valuation models. These models can also predict how the value of the option will change in the face of changing conditions. Hence, the risks associated with trading and owning options can be understood and managed with some degree of precision.

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