A thank you note is a short message expressing gratitude to someone for a gift, favor, or kind gesture. These notes can be handwritten or typed and are often sent after special occasions like birthdays, weddings, or holidays. They help strengthen relationships by showing appreciation and acknowledging the thoughtfulness of the giver. Writing a thank you note typically includes a greeting, a specific mention of what you are thankful for, and a closing statement. It is a simple yet meaningful way to convey your feelings and can be sent via mail or electronically, depending on the situation and your relationship with the recipient.