Who" is a Subject Pronoun
"Who" is a subject pronoun like "he," "she" and "we" in the examples above. We use "who" to ask which person does an action or which person is a certain way.
Examples:
Who made the birthday cake?
Who is in the kitchen?
Who is going to do the dishes?
"Whose" is a Possessive Pronoun
"Whose" is a possessive pronoun like "his," "her" and "our." We use "whose" to find out which person something belongs to.
Examples:
Whose camera is this?
Whose dog is barking outside?
Whose cell phone keeps ringing?