Congratulatory messages are expressions of joy and support given to someone who has achieved a milestone or success. These messages can be sent for various occasions, such as graduations, promotions, weddings, or personal achievements. They often include words of praise and encouragement, helping to celebrate the recipient's hard work and accomplishments. These messages can be delivered in various forms, including cards, emails, or spoken words. They can be formal or informal, depending on the relationship between the sender and the recipient. Common phrases include "Congratulations on your graduation!" or "Well done on your promotion!" to convey heartfelt sentiments.