Topic overview

Start with the big picture

This introductory topic focuses on two connected questions: what epidemiology means and what its scope encompasses. Together, these ideas establish a starting point for approaching epidemiology as a field of study. The preview is intentionally broad because the supplied source snapshot does not include detailed headings, examples, or key points. The full lesson develops the topic further, helping learners build a clearer understanding of the field’s definition and reach before moving on to more detailed study within the chapter.