What is the difference between "who" and "whom"?

[Kira]

Hi ! Tell me please if you can
What is correct
Who does Ann hate?
or
Whom does Ann hate?
When do you use Who
When do you use Whom
thank you
Kira

[Alan]

The main difference is that one is the subject (who) and one is the object (whom). Take these two examples:

That's the man who (subject) spoke to me yesterday

That's the man whom (object) I (subject) met yesterday.

If you break these examples down into separate sentences, you have:

That's the man. He (subject) spoke to me yesterday

That's the man. I met him (object) yesterday

Hope this helps
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[rich7]

Quite an explanation Alan.....

Thanks,,,,
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