Dhol
Dhol is a very popular folk drum of northern India, Pakistan and Bangladesh. It is a barrel shaped, sometimes cylindrical drum, with skins on both sides. It has one side which has a high pitch and another side which has a lower pitch. It is very popular in folk music. The dhol is essentially nothing more than a larger version of the dholak.
The term "dhol" has a generic quality about it. Virtually any large barrel shaped or cylindrical drum may be called a dhol. Therefore, whenever one wishes to be more specific one generally attaches a descriptive term to make things clear (e.g., "bhangra dhol").
The history of the dhol is not clear. One source of confusion may be that the origin of the term "dhol" may be different from the origin of the instrument itself. The word "dhol" is probably of Persian origin. It is probably derived from the Persian "dohol" or "duhul". However images of dhol players appear to be present in the bas relief carvings on Indian temple walls from the earliest times. It is possible that both the instrument as well as the name have some deep Indo-European connection. However, at this point it is just really difficult to make any firm statement as to the origin of the instrument.