A business card is a small, usually rectangular piece of paper or plastic, containing information about a person or company. It typically includes the name of the individual or organization, their contact information (such as phone number and email address), and sometimes a logo or other visual elements. Business cards are often exchanged at professional events, meetings, or networking opportunities to facilitate communication between individuals or organizations. They serve as a convenient way for people to remember important details about each other after the event is over.