AdWords (Google AdWords) is an advertising service by Google for businesses wanting to display ads on Google and its advertising network. The AdWords program enables businesses to set a budget for advertising and only pay when people click the ads. The ad service is largely focused on keywords.
Display ads :
Display ads allow you to create highly targeted campaigns based on what you know about your customers, such as interests or demographics.
Google AdWords remarketing :
Google AdWords remarketing is a form of online advertising that enables sites to show targeted ads to users who have already visited their site. Past visitors will see these ads while they are browsing the web, watching YouTube videos or reading news sites, for example—keeping your brand top-of-mind and enticing visitors to come back for more.