An e-card is similar to a postcard or greeting card, with the primary difference being it is created using digital media instead of paper or other traditional materials. E-cards are made available by publishers usually on various Internet sites, where they can be sent to a recipient, usually via e-mail.

E-cards are digital content, which makes them much more versatile than traditional greeting cards. For example unlike traditional greetings, e-cards can be easily sent to many people at once or extensively personalized by the sender. Conceivably they could be saved to any computer or electronic device or even viewed on a television set, content could be even digital video or digital audio in terms of varied usage. Typically an e-card sender chooses from an on-line catalog of e-cards made available on a publisher's web site. After selecting a card, the sender can personalize it to various degrees by adding a message, photo, or video.