Question

what is the difference between who and whom?​

Answer 1

“Who” and is a subjective pronoun. “Whom” is an objective pronoun. That simply means that “who” is always subject to a verb, and that “whom” is always working as an object in a sentence. ... “Who,” the subjective pronoun, is the doer of an action.

Answer 2

“Who” and is a subjective pronoun. “Whom” is an objective pronoun. That simply means that “who” is always subject to a verb, and that “whom” is always working as an object in a sentence. ... “Who,” the subjective pronoun, is the doer of an action. Who should be used to refer to the subject of a sentence.
Whom should be used to refer to the object of a verb or preposition. If you can replace the word with “he” or “’she” then you should use who. However, if you can replace it with “him” or “her,” use whom. Let’s look at some examples.
This is who warned me. (It is He/she warned me. Not “him/her” warned me)
With whom am I speaking? (I am speaking with him/her. Not I am speaking with he/she)