This lecture covers the phenomenology of real gases and fluids, focusing on the Van der Waals gas, critical point, and Clapeyron diagram. It explores the behavior of fluids around the critical point, with examples of supercritical fluids in nature and their applications, such as decaffeinating coffee and astrophysical phenomena. The lecture also discusses the use of supercritical fluids in drying processes, emphasizing their unique properties and applications in various fields.