You don’t here the term digital photography card often. Some may consider it the actual storage card that you put digital photographs on. There are also eCards and card that are put in digital photo frames which are ever decreasing in size as technology evolves.
With digital frames, they are great, but need to be powered constantly and are just not small enough these days. It would be a great idea if there was an idea to have like a plastic card, much like a credit card sized device that will be able to show your digital photos and be able to store and cycle them. These can be connection from your phone or through the cloud or have internal storage. Sounds like a Kickstarter idea.