It is typical for corporations to offer up their shares on a primary share market through a process known as an initial public offering. This means that when one chooses to invest in the primary share market, they can do so through an initial public offering or IPO. To invest in both primary and secondary markets, it is necessary for a trader to have their own Demat account which will hold electronic copies of their shares. Additionally, a trading account is also important which will help in buying and selling shares online.