Google Now cards are slowly becoming one of the standards in notifications. This special feature is used by several apps and services to bring quick and relevant information to a user at a single glance on his phone. Right on the lockscreen or notifications screen, you can view content and some suggestions to the information you need. For example, while watching a TV show, a Google Now interactive card can provide you information about the show including the cast, director, etc. Interactive cards have become so useful that Google decided to make them available for YouTube creators.