An RSVP card is a small card included with invitations, typically for events like weddings or parties. It allows guests to confirm their attendance by responding with a simple "yes" or "no." This helps the host plan for the number of attendees, ensuring there is enough food, seating, and other arrangements. RSVP cards often include a space for guests to write their names and may also request additional information, such as meal preferences. They are usually sent back in a pre-addressed envelope, making it easy for guests to respond promptly. This practice is common in formal events, including those organized by event planners or wedding coordinators.