A business card is a small, printed, usually credit-card-sized paper card that holds your business details, such as name, contact details and brand logo. Your business card design is an essential part of your branding and should act as a visual extension of your brand design.A business card is a small, printed, usually credit-card-sized paper card that holds your business details, such as name, contact details and brand logo. Your business card design is an essential part of your branding and should act as a visual extension of your brand design.