Internet has made possible what could never be imagined in earlier times, that is, gatecrashing into the homes of the target audience and selling them the products. In the past decades, who could have thought a salesman can enter your home persistently and sell you the products. Yes, marketing through the Internet can be likened to a salesman entering your home and selling his products. But who is behind this form of advertising. It is none other than an online advertising company.