(User Interface Element) Super popular these days, cards are small rectangular or square modules that contain different kinds of information—in the form of buttons, text, rich media, and so on. Cards act as an entry point for the user, displaying different kinds of content side by side which the user can then click on. Cards are a great UI design choice if you want to make smart use of the space available and present the user with multiple content options, without making them scroll through a traditional list.