Digital Railcards are stored within the Railcard app on your smart phone or tablet, meaning there's no need to carry the physical card around with you. They can be stored on up to two devices and used quicker than plastic Railcards as they do not need to be sent in the post.
Can I change my physical Railcard to digital?
You cannot swap a plastic Railcard to a digital Railcard. However, when the time comes to renew your Railcard you can do this online and choose to have a digital Railcard.