“MR” stands for “Mister,” which is a title typically used to address a man who is married or of high social status. “MRS” stands for “Mistress,” which is a title typically used to address a married woman.

The abbreviation “Mr.” is short for “Mister” and is used as a title of respect for a man. It is typically used before a man’s surname or full name.

The abbreviation “Mrs.” is short for “Missus” or “Mistress” and is used as a title for a married woman. It is typically used before a married woman’s married surname or full name.

Both “Mr.” and “Mrs.” are commonly used in formal and professional settings, and are often used to address someone politely and respectfully in written or spoken communication.