A cancellation letter is a formal written communication used to terminate a contractual agreement, subscription, service, membership, or appointment. It typically includes specific details such as the account or membership number, effective cancellation date, reason (if applicable), and a request for confirmation of the cancellation. The tone of a cancellation letter should be polite, clear, and concise, ensuring all necessary information is provided to facilitate a smooth termination process. These letters are often used in various contexts such as canceling subscriptions, services (like gym memberships or utilities), appointments, or even contracts with vendors or suppliers.