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Stock options are very different than regular shares of stocks, so options trading is also going to require a different understanding and different strategy. If you want to buy a stock you will be entitled to hold however many shares you purchase, and those shares are redeamable for anyone who wants to buy it for as long as those shares and the company with it are still around and trading on the stock exchange. However, if you look to buy call stock options, you are basically getting a contract that is limited in how long it's good for and it may only entitle you the right to trade the option contract itself only for as long as the stock option contract is still valid and there is a buyer willing to take on the risks for you to sell it.