Background and Objective One of the most dangerous respiratory diseases is pneumonia, one of the ten leading causes of death globally. Our goal is to gather information about Hospital-acquired pneumonia (HAP), Community-acquired pneumonia (CAP), and
Ventilator-associated pneumonia (VAP) to give people specific information.HAP is a common infection in hospitals, which is the second most common nosocomial infection and causes inflammation parenchyma. In CAP ، we have various risk factors, including age and gender, and which we have some specific risk factors. VAP is one of the deadliest nosocomial infections. According to the Centers for Disease Control and Prevention, VAP is pneumonia that develops within ۴۸ hours of an artificial airway. Search Method In this study, the search was based on the English language from January ۱, ۲۰۱۲, to ۲۰۲۰; the search process was performed in pub med, for this search process according to medical subject headings (MeSH), the keywords were used Hospital-acquires pneumonia, Community-acquired pneumonia, and Ventilator-associated pneumonia.Findings We Categorized our findings into four headlines. (Etiology, Risk Factor, Clinical Presentation, Diagnostics). In etiology, we named the most common pathogens that cause CAP, Hap, and VAP. In Risk factor, show some of the things that could increase the chance of developing these diseases. The clinical presentation shows the most common characteristics of the patient who had developed HAP, CAP, and VAP. In Diagnostics, we try to give you the common prosses that a doctor goes through to Diagnoses these diseases. Conclusion By collecting information about pneumonia, we can raise awareness about the disease . The simplicity of the information and the type of writing also helps to understand better the public, which makes this information not specific to a particular group, and everyone can use and understand it.