Mr. is a common English honorific title used for men, usually as a prefix before their last name. It is derived from the Latin Dominus, meaning 'lord' or 'master'.
The exact usage and pronunciation of the title varies by region and culture. In some places, it is used in formal or professional settings to show respect or position, such as in business or academia. In other situations, it may be used to show deference or politeness in social interactions.
Despite its common usage, there has been some criticism of the Mr. title as being gender-specific and reinforcing outdated gender roles. Some people prefer to use gender-neutral titles, such as Mx. or simply using the person's name without a title.