A case study is an in-depth analysis of a person, group, or event that is studied over time. It involves qualitative research methods like interviews, observations, and document analysis to provide an understanding of real-world situations. Case studies are useful for gaining contextual knowledge about a specific subject. They allow exploration of key characteristics and implications. While case studies provide rich details, their findings cannot be generalized to a larger population. There are different types of case studies defined by their purpose and subject matter. Researchers must consider ethical issues when conducting case studies involving people.