Explore the captivating realm of fluid dynamics in this lecture from the series "The Fascinating World of Flows." Delve into the fundamental concepts of describing flows, their instability mechanisms, and the transition to turbulence. Connect these principles to everyday phenomena, such as river patterns around obstacles, cloud formation, and the necessity of stirring to mix substances. Gain insights into how living organisms interact with and influence fluid flows. Delivered by Prof. Samriddhi Sankar Ray from the International Centre for Theoretical Sciences, this lecture is part of a comprehensive course designed to build a strong foundation in fluid mechanics and its applications in various natural and engineered systems.