Twitter cards allow a user to attach a video, image or other creative media after the standard Twitter maximum 140 text. This ultimately is a large factor in driving more traffic from Twitter. It’s tough to stand out on twitter with the enormous volume of tweets proliferating the platform each second, but Twitter cards are one of the best ways to stand out and make users click your links. You can see a full overview on how to implement twitter cards on their official website:
Tweets with images attract 18% more clicks, 89% more favorites and 150% more retweets. From 2013-2014 more websites are using twitter cards, especially top 10k Alexa websites. Top 10k sites using cards rose from 10,000 to 18,000, almost doubling usage! Business websites have the largest adoption rate of twitter cards. Without leaving Twitter, followers can download an app, visit a landing page, sign up for a newsletter or contest and use a coupon.