Who’s is the contraction and Whose is a possessive word.
Who’s is the contraction of who is or who has.
Example of Who’s
Who’s is this glass of wine ? X – incorrect
Whose is this glass of wine? √ – correct
Whose It’s used in questions and relative clauses.
Example of Whose
Whose is that over there ? X – incorrect
Who’s that over there ? √ – correct
