A vortex ring is a three-dimensional structure formed when a fluid, such as air or water, moves in a circular motion. This phenomenon occurs when a fluid is expelled from a source, creating a toroidal shape that can be observed in various situations, like smoke rings or underwater bubbles. The ring maintains its shape as it travels through the surrounding fluid, demonstrating the principles of fluid dynamics. Vortex rings are often studied in fields like aerodynamics and hydrodynamics because they help scientists understand how fluids behave. They can also be found in nature, such as in the wake of marine animals or during volcanic eruptions, showcasing their relevance in both natural and artificial systems.