Quota sampling is a structured recruitment approach used in qualitative and quantitative research to ensure representation across defined population segments, such as age, gender, region, or purchase behavior. Researchers set quotas for each subgroup before fieldwork begins, then recruit participants until every cell is filled. In research operations, quota sampling gives teams control over who contributes to findings, reducing the risk that dominant or easy-to-reach groups skew results. It is particularly valuable in concept testing, brand tracking, and segmentation studies where understanding differences across specific audience profiles is as important as understanding the overall picture.