-buying the right to buy

the main idea in this kind of option is:
a trader expects a stock to move up in few days or weeks, but right now he’s not interested in buying the stock or do not hold enough money to buy it, in the same time he is afraid of losing the chance of the good price, so he decides to buy a contract to give him the right to buy these stocks in the future.
each contract in options trading consists of 100 shares

to be continued>>>>>>>>>>>