Final answer:
Focus groups are a type of research method used in marketing to gather feedback from a representative group of people. They involve discussions and feedback on specific products, services, or ideas.
Step-by-step explanation:
Focus groups are a type of research method used in marketing. They involve a group of people who are representative of a target audience or customer segment and are brought together to discuss and provide feedback on a specific product, service, or idea. In the case of Serge Casey, the marketing researcher, he is conducting a focus group to test the feelings of customers regarding a new phone-pricing package.