Buyer: Buyer is a market participant (trader/investor) who takes a long futures position or buys an option. An option buyer is also called a taker, holder, or owner.
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.
Call: There are three meaning of the "Call" term. It could be:
1) An option contract giving the buyer the right but not the obligation to purchase a commodity or other asset or to enter into a long futures position;
2) a period at the opening and the close of some futures markets in which the price for each futures contract is established by auction;
3) the requirement that a financial instrument be returned to the issuer prior to maturity, with principal and accrued interest paid off upon return.
Combination: Combination is a combination of puts and calls that are held either long or short with different strike prices and/or expirations. Types of combinations include straddles and strangles.
Futures: Futures (also called Futures Contract) is a legally binding agreement to buy or sell a commodity or financial instrument at a later date. Futures contracts are normally standardized according to the quality, quantity, delivery time and location for each commodity, with price as the only variable.
Put: Put is an option contract that gives the holder the right but not the obligation to sell a specified quantity of a particular commodity or other interest at a given price (the "strike price") prior to or on a future date. Call options is another type of options.
Put Option: Put Option is an option which gives the buyer the right, but not the obligation, to sell the underlying futures contract at a particular price (strike or exercise price) on or before a particular date. Call options on futures gives right to buy underlying futures contracts at specific price on or before expiration date.
Trader: Trader is a merchant involved in cash commodities or a professional speculator who trades for his own account and who typically holds exchange trading privileges.
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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.