This document provides an overview of inflammation. It defines inflammation as the body's response to local injury or infection and discusses the signs and classifications. Acute inflammation is described as persisting for minutes to days and involving vascular changes like increased blood flow and permeability, as well as cellular changes such as leukocyte migration and phagocytosis. Chronic inflammation can last for weeks or years and is characterized by mononuclear cell infiltration and simultaneous tissue destruction and healing. The document also examines specific types of inflammation including granulomatous inflammation and inflammation of the pulp, periodontium, and gingiva.