Commodities are goods such as corn, copper, crude oil, orange juice, oats, gold and wheat.

Technically, a futures contract is an agreement to make or accept delivery of a commodity on a certain day at a certain price. In practice this rarely happens unless you're a manufacturer who actually wants the goods. The vast majority of futures traders are simply speculating on whether the price will go up or down and never take delivery of an item.

Futures contacts include commodities and also stock market indices such as the S&P 500, Dow Jones and the Russell. Indices are simply a composite of securities that provide an overall reading of the market or some section of it.

The S&P 500 (Standard & Poor's 500) tracks 500 of the largest companies in the US market. The Dow Jones Industrial Average tracks only 30 of the largest and longest-established companies while the Russell 2000 is an index of smaller stocks.

Essentially, commodities and indices are futures and 期指是什麼 traded in much the same way although traders may use the terms interchangeably.