They are widely used for "postcards to voters" campaigns, where handwritten messages are sent to encourage voter turnout or support specific causes. Many activists use them to contact government representatives or the Supreme Court because they are harder to ignore than emails.
Plain cards are the foundation of "Mail Art," a global movement where participants create unique, shippable artwork. They are also perfect for practicing handwriting or creating custom "homemade" cards for friends. buy plain postcards
Collectors and pen pals through platforms like Postcrossing often request specific types of postcards to exchange with people worldwide. Environmental postcard templates for representatives They are widely used for "postcards to voters"