Purok (English: District), also known as zone, is a political subdivision of a barangay. It is the smallest unit of governance in the Philippines led by a barangay councilor appointed to lead the purok. It is not, however, officially considered a local government unit.
A purok is typically composed of twenty to fifty or more households, depending on the particular geographical location and cluster of houses. If created and given a mandate by an ordinance of the barangay, municipality, or city, a purok could perform government functions under the coordination and supervision of their local officials.
References
Purok Wikipedia(Text) CC BY-SA