The List and Set both extend the collection interface. However, there are some differences between the both which are listed below.
* The List can contain duplicate elements whereas Set includes unique items.
* The List is an ordered collection which maintains the insertion order whereas Set is an unordered collection which does not preserve the insertion order.
* The List interface contains a single legacy class which is Vector class whereas Set interface does not have any legacy class.
* The List interface can allow n number of null values whereas Set interface only allows a single null value.
