[Grammar] When to use the term Ms. or Miss

[Denis Wilson]

Does Ms. refer to a single or divorced or widowed woman?

[thedaffodils]

[Not a teacher.]

Miss (TITLE) noun
1 a title or form of address for a girl or a woman who has never been married:
Dr White will see you now, Miss Carter.
Miss Helena Lewis
Compare Ms; Mrs.
2 OLD-FASHIONED used as a form of address for a girl or young woman who does not appear to be married:
Excuse me, Miss, could you tell me the way to the station?
3 MAINLY UK sometimes used by children to address teachers who are women:
Can I go to the toilet, Miss?
4 When a woman wins a beauty competition, she is often given the title Miss and the name of the place that she represents:
Miss India/UK
the Miss World contest
5 UK OLD-FASHIONED miss a girl or young woman, especially one who behaves rudely or shows no respect:
You're a cheeky little miss! Apologize at once.

Ms (TITLE) noun [U]
a title used before the family name or the full name of a woman, whether she is married or not:
Ms Hill/Ms Paula Hill
[as form of address] What can I do for you, Ms Wood?

The definitions are from Cambridge Dictionary. I think these are clear enough.

[Anglika]

Basically, the answer is no - it does not refer to divorce.

It is a form developed by those people who resented being pigeonholed by the titles Mrs[= married (or divorced)] and Miss [= unmarried].