This document discusses four major types of qualitative research: phenomenology, ethnography, case study, and grounded theory. Phenomenology aims to understand individuals' lived experiences of a phenomenon through in-depth interviews. Ethnography seeks to discover and describe the culture of a group through observation and interviews. Case study provides a detailed analysis of one or more real-world cases or situations. Grounded theory develops theories that are grounded in systematically analyzed qualitative data through open, axial, and selective coding.