What Are Their Main Differences?
The main difference between them refers to the nature of the words. We mean 'who' is a subjective pronoun; on the contrary, 'whom' is an objective pronoun.
How These pronouns work as Interrogative Pronouns
'Who' and 'whom' are used as interrogative pronouns to ask for information about a person or people. But it is important to know that 'who' asks for the subject, while 'whom' asks for the object of a sentence.
Who and Whom as Relative Pronouns
Now, that you know the main difference between 'who' and 'whom'; It is good to know that 'who' and 'whom' are used in relative clauses as relative pronouns to connect the sentences. Keep in mind that you can use them either in restrictive or non-restrictive clauses.
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Important to Know!
Do not forget to put a comma on both sides of a non-restrictive clause.