A birthday card is a greeting card specifically designed to celebrate someone's birthday. It often features colorful designs, images, and messages that convey good wishes. People typically give birthday cards to friends, family, or colleagues as a way to express their feelings and celebrate the special day. Birthday cards can be purchased from stores or made at home. They may include personal messages, quotes, or even drawings. Many people enjoy collecting or displaying birthday cards as a reminder of their special day and the people who care about them, making them a cherished part of birthday celebrations.