In this feature (based on WALS feature 64, by Martin Haspelmath), we ask whether nominal conjunction ('Pat and Kim') and verbal (or clausal) conjunction ('The kids are playing and the parents are talking') are expressed in the same way or differently. While European languages generally have the same conjunction marker for both functions, African languages typically use different markers for these two situations. Overlap means that one marker has both functions and another marker has just one of the functions. If a language has three markers, two can differentiate and the third can lump the two functions, so that there is overlap and differentiation.
