What is option trading?

An options contract offers the buyer the right to buy, not the obligation to buy at the specified price or date. Options are a type of derivative product.

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Kind of options

Buying Options
Buying an options contract is in practice no different to buying stock. You are basically taking a long position on that option, expecting it to go up in value. You can buy options contracts by simply choosing exactly what you wish to buy and how many, and then placing a buy to open order with a broker. This order was named as such because you are opening a position through buying options.
Selling & Writing Options
There are basically two ways in which you can sell options contracts. First, if you have previously bought contracts and wish to realize your profits, or cut your losses, then you would sell them by placing a sell to close order. The order is named as such because you are closing your position by selling options contracts.
Exercising Options
Options traders tend to make their profits through the buying, selling, and writing of options rather than ever actually exercising them. However, depending on the strategies you are using and the reasons you have bought certain contracts, there may be occasions when you choose to exercise your options to buy or sell the underlying security.
Options Spreads
What really makes trading options such an interesting way to invest is the ability to create options spreads. You can certainly make money trading by buying options and then selling them if you make a profit, but it's the spreads that are the seriously powerful tools in trading. A spread is quite simply when you enter a position on two or more options contracts based on the same underlying security; for example, buying options on a specific stock and also writing contracts on the same stock.