Calling cards are small cards that typically contain a person's name, contact information, and sometimes a brief message or design. Historically, they were used by individuals to announce their presence when visiting someone’s home, allowing the host to know who had called. Today, calling cards can also refer to business cards, which serve a similar purpose in professional settings. In the digital age, calling cards have evolved to include virtual formats, such as digital business cards shared via smartphones or email. These modern versions often include links to social media profiles or websites, making it easier for people to connect and network in various contexts.