Pneumonia is an umbrella term for infection-driven inflammation of the lung parenchyma. Community-acquired pneumonia (CAP) specifies the acquisition context: pneumonia that develops outside hospitals and without recent significant healthcare exposure (e.g., recent hospitalization or long-term care). This distinction is operationally important because the likely pathogens and resistance patterns differ between CAP and healthcare-associated or hospital-acquired pneumonia. CAP more often involves community pathogens, whereas hospital-linked infections may involve more resistant organisms. In short, “pneumonia” is the condition; “CAP” is a setting-based subtype that informs risk stratification, empiric therapy decisions, and follow-up strategy.