Email sign-offs are the closing phrases used at the end of an email to convey a sense of professionalism and warmth. Common sign-offs include phrases like "Best regards," "Sincerely," and "Thank you." The choice of sign-off can reflect the relationship between the sender and recipient, as well as the tone of the message. Using an appropriate sign-off is important for effective communication. It helps to leave a positive impression and can set the tone for future interactions. Different contexts, such as formal business emails or casual messages to friends, may require different styles of sign-offs to match the situation.