Is functional dependency a many to one relationship between two sets of attributes?

Yes, functional dependency represents a many-to-one relationship between two sets of attributes in a database. Specifically, if a set of attributes A functionally determines another set of attributes B, it means that for each unique value of A, there is exactly one corresponding value of B. This implies that multiple instances of A can relate to a single instance of B, illustrating the many-to-one nature of the relationship.