The Google Display Network is able to reach 90% of the internet users worldwide and is the largest network group on the internet. It is a bit different in that it allows you to display ads on Google’s partner websites, of which there are over 2 million. You can reach people when they are browsing their favourite websites or YouTube. Essentially Google serves the ads to people that have an interest in your product or service.
You may notice that when you are on websites such as Property24 there are ads that regularly show up in your articles. This is the Google Display Network targetting you.