In which sampling method is the population first divided into subgroups, and a random sample then drawn from each subgroup?

In stratified sampling the population is split into strata that share a characteristic, and units are selected at random within every stratum, which makes it a probability method. Quota sampling also uses subgroups but fills each quota by non-random choice. Cluster sampling selects some whole groups at random rather than drawing from each group, and convenience sampling takes whoever is easiest to reach.