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.
Exchange: A central marketplace with established rules and regulations where buyers and sellers meet to trade futures and options contracts or securities. Exchanges include designated contract markets and derivatives transaction execution facilities.
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.
Local: Local is a member of an exchange who trades for his own account. Traditionally Local trades on an exchange floor, and Local's activities provide market liquidity.
Pit: Pit (also referred to as a ring) is the area on the trading floor where trading in futures or options contracts is conducted by open outcry. It is a specially constructed area on the trading floor of some exchanges where trading in a futures contract or option is conducted. On other exchanges, the term ring designates the trading area for commodity contract.
Ring: Ring is a circular area on the trading floor of an exchange where traders and brokers stand while executing futures trades. Some exchanges use pits rather than rings.
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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.