Site Links the text that appears below the ad text. You can add site links to your ad, and you can also add its description within 2-3 lines. Site links show a shortcut to link you directly to a specific section of your website. Site links are easy to implement and play an important role in successful Google AdWords campaigns. It directs customers to a unique landing page and helps them get what they are looking for.
It is an effective way to increase Click through Rate. It improves your ad rank and helps you to attract potential customers before a click occurs.