Option: Option is a contract that gives the buyer the right, but not the obligation, to buy or sell a specified quantity of a commodity or other instrument at a specific price within a specified period of time, regardless of the market price of that instrument. There are two types of options: Put Options and Call Options.
Asian Option: Asian Option is an exotic option whose payoff depends on the average price of the underlying asset during some portion of the life of the option.
Lookback Option: Lookback Option is an exotic option whose payoff depends on the minimum or maximum price of the underlying asset during some portion of the life of the option.
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.