What’s the difference between Miss and Ms.?

Miss” is a title used for a young unmarried woman or girl (e.g, “Miss Muffet”). It is not used for a married woman. “Miss” is often considered dated, so it is preferable to use “Ms.”

Mrs.” is a title used for a married woman.

Ms.” is a title for woman who is married or whose marital status is unknown, for an older unmarried woman, or for situations where marital status is not emphasized. It can be used both for married and unmarried women in the same way that “Mr.” is used for unmarried and married men. Nowadays, “Ms.” is the most common way to address a woman, as it is unrelated to marital status.