There is no telling, based on your question, how the weights are constructed.
Generally, weights accommodate the basic counting rules that are responsible for the estimates being consistent for their population targets. They correct for informative sampling when different units with different characteristics of interest may have different probabilities of selection and response, either by design (certain units are intentionally oversampled) or by the nature of the population (households that can be reached on landline/fixed line phones are usually older and less mobile than those that can be reached on cell phones, at least in the U.S.). Strata and primary sampling units, on the other hand, are responsible for correct variance estimation. So they have rather different functions in survey design and analysis with complex survey data. Please see references in survey-weights for additional explanations.