Adwords is the system that Google has designed to assist in marketing product or services in Google search engine and its affiliated sites. It will place a text ad that appears when people search for phrases associated to your offering.
Adwords work on bidding system if the bidding price is higher your ad will appear on top of the Google page. Adwords works on “pay per click” that means you only pay the amount you have bid if someone taps on your ad as a result of a web search.
Google Adwords behave differently to traffic that comes from Google Adwords or “Pay Per Click”. The traffic that comes through surfing often visits the website for information, whereas the traffic via pay per click knows what they are clicking on and what they want to buy. So few visitors through Adwords might be more valuable than million visitors. Read 20 Digital marketing Interview Questions