Hashtags on Twitter allow users to categorize tweets by relevant keywords or phrases, helping those tweets be more easily found in search. A hashtag campaign is a marketing initiative used to gain attention and engagement on a specific topic or product through a consistent hashtag. For example, when launching a new car, the Audi brand had users tweet about wanting to ride the car using "#WantAnR8", then surprised some of those users by letting them drive the car for a day, promoting the new vehicle through an engaging hashtag campaign.