Community acquired pneumonia (CAP) refers to an acute infection of the lungs that occurs in individuals who have not been hospitalized or resided in a long-term care facility in the previous 14 days. It is a common condition that can be caused by a variety of infectious agents, including bacteria, viruses, and fungi. Risk factors for CAP include advanced age, smoking, chronic lung disease, and immunosuppression. Research in the area of community acquired pneumonia focuses on understanding the causes, risk factors, diagnosis, treatment, and prevention of this condition. This research may involve studying the epidemiology of CAP, identifying new pathogens responsible for the disease, developing more accurate diagnostic tests, optimizing treatment strategies, and investigating ways to reduce the incidence of CAP through vaccination or other preventive measures. By advancing our knowledge of CAP, researchers aim to improve outcomes for individuals who develop this common and potentially serious respiratory infection.