A focus group is an approach to market research. It requires gathering 6-10 persons together, an experienced moderator, capable of holding discussion during 1-1.5 hours, and a questionnaire containing 10-12 issues about a product, a new feature, a marketing campaign, or a service. The main moderator aim is to get as many variable opinions, ideas, and feedback as possible. So, the moderator is also responsible for taking notes and observing.
A focus group is formed according to specific purchase history, age, location, behavior patterns. Huge brands usually run surveys in different towns, having a focus group in each.