SunDay Holidays paid a fee to Google to display a link of their website when a user enters a keyword related to holidays or vacations. The link gets displayed on the right side of the search results page. This link is an example of:

Sponsored link

Explanation:

Sponsored link: A paid advertisement that shows up on search engines such as Google in hypertext form when a search is done using some keywords. The advert are product and services that relates to the searched word.

Sponsored link is one of the most effective ways of advertisement on the Internet because it generate significant results. Sponsored link generates traffic on the website of the one advertising.