What is the difference between Join and Link?

Join:

(i)It defines M:1 relation between a field in BC to the Column in table.

(ii)Source Field is the Foreign key field in BC while Destination column is the Primary Key column in Table.

Link:

(i)It defines 1:M relation between a field in parent BC to the field in the child BC.

(ii)Source Field is the Primary Key field in Parent BC while Destination Field is the Foreign Key field in child BC.