"Yours Sincerely" is a common closing phrase used in formal letters and emails. It expresses respect and professionalism towards the recipient. This phrase is typically used when the sender knows the recipient's name, making it suitable for business correspondence or personal letters where a formal tone is appropriate. In contrast to more casual sign-offs like "Best" or "Cheers," "Yours Sincerely" conveys a sense of earnestness. It is often followed by the sender's name and, in some cases, their title or position, reinforcing the formal nature of the communication.