App Cards are the foundation Twitter uses to sell mobile app ads, and as such they're better suited for the mobile experience. Developers working for app publishers can help them promote their apps with as little as 13 lines of code. App Cards display a preview of the app icon, name, description and other attributes like ratings or price. When you see these cards in your timeline on Twitter's mobile apps you can click the download button at the bottom of the card to quickly install the app on their device.
Product cards are another type tailored for brands and retailers because they present more detailed information about products and retail items on Twitter. With nine lines of codes, product cards will showcase products with a square image, description and two other key details of the seller's choosing. Users can do directly to the product page for these items by clicking on the link at the bottom-left corner of the card container.
Twitter Cards > 140 characters
Twitter Cards bring more than 140 characters to a tweet and they're relatively ubiquitous on the platform now, although some implementations aren't fully realizing the potential. When you include a URL in a tweet, Twitter's system crawls that site to fetch the card type and content that will be displayed in an expanded window on users' timelines.
As long as developers add and maintain the proper code and follow Twitter's rules of the road, users who see or share tweets linking back to these sites will see more media and information in their timelines. Twitter Cards may be operating in the background from a developer's perspective, but users see and interact with these enhance tweets every time they pull up their timeline.
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