Mrs. is a title for a married woman.
Mrs. is an abbreviation for "Mistress".
Mrs. has a period at the end.
Miss is a title for single women.
Single women are unmarried.
Unmarried is the opposite of married.
Ms. or Ms
Ms. is a title for all women.
It can be spelled with or without the final period. (Ms. or Ms)
Both married and single women can use the title Ms.