Card
Cards display a distinct collection of content and actions in a flexible container.

Contained
Each card is a standalone object, even within a card group. The actions and information within one card is distinct from others.
Summarized
A card focuses on high-level details to inform users of the card’s purpose and aid in deciding whether to interact with more content.
Interactive
Cards are implicitly interactive by nature whether they have nested buttons or not. They are never static or decorative.