Confused between stratified and cluster sampling. Will u plz tell specific points

confused between stratified and cluster sampling. Will u plz tell specific points

in cluster sampling, we take randomly built clusters. whereas in startified sample, we divide the sampling frame (or population) into catgeories or strata and then select a predefnied certain number from “each” strata… this is not the case in cluster, in which you simple select clusters and randomly select subjects from random clusters