Futures contracts are an a newcomer market instrument, with the inception starting around 1859, they have grown in popularity along with something called the forward contract. These specific contracts are legally binding resolve for buy or sell (deliver or accept) commodities, shares, bonds, currencies, precious metals, tangible commodities and more, also added within the contract is the future date this transaction will require place. These will almost always be traded in a regulated futures exchange, but naturally will vary dependent on the actual asset.
Future contracts will also be set at a pre-determined price. Future trading and forward trading are extremely similar, however may also be quite different. Both are agreements between two parties, the location where the future is traded inside the regulated exchange, nevertheless the forward contract is created between private parties and non-regulated, often one party will default.
There's two kinds of contracts in trading futures, one being single and the other being multiple. The single futures contract may be the smallest unit that may be traded, and will be no more than one share. Multiple futures is normally employed by seasoned investors are as they state, multiple shares, stocks, etc. The investor will either go long or go short when getting into the contract. Going long is when the trader believes the prices will rise. Going short could be the the complete opposite of going long. He enters the contract at the position the costs are going to decline.
The two main reasons for that availability of future trading are that investors could be hedgers or speculators. Hedging may be the strategy of opening opposing positions in underlying instruments to reduce the volatility of one's' portfolio thus reducing risk. Hedgers are trying to reduce and sometimes even eliminate their risk. The speculator will require the chance how the hedger is avoiding. Speculators undertake the risk involved in order to make profit within the underlying assets.
To summarize, futures contracts and future trading are standardized contracts, which commit too parties for the delivery of a product on a set date later on with a set price. It offers the opportunity for the investors that desire to reduce their risk (hedgers) by transferring the chance up to the investors (speculators) whom are prepared to take this risk with the hopes of generating money.