Pneumonia represents a spectrum of diseases that range from community-acquired to health care-associated pneumonia. Despite advances in diagnosis, antimicrobial therapy, and supportive care, pneumonia remains an important cause of morbidity and mortality, particularly in elderly patients and in those with significant comorbidities. Community-acquired pneumonia (CAP) is the leading cause of death from infectious disease in Korea. This article provides a synopsis of recent studies regarding various types of pneumonia, with a focus on CAP.