Are you familiar with Twitter Cards? Let this article show you what they are and how to use them. Twitter Cards make it possible for you to attach media experiences to Tweets that link to your content. Simply add a few lines of HTML to your webpages, and users who Tweet links to your content will have a “card” added to the Tweet that’s visible to all of their followers.
Summary Card: Default Card, including a title, description, thumbnail, and Twitter account attribution.