Online stock trading means buying and selling shares of companies publicly traded on a stock exchange.
The price of a particular stock is determined by the total number of shares a company has created, usually measured in the currency of the stock market it is listed on, for example, pence (in the UK), euro (in Europe), yen (in Japan) and US dollars (in the US).
In line with the law of supply and demand, when there are more traders who want to buy a company than sell it, its stock price typically rises. Conversely, when there are more traders who want to sell a company than buy it, the stock price tends to decrease.
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