The phrase "smooth transition" refers to a change that is made in a way that minimizes disruption or difficulty. It implies a seamless and effortless shift from one state, situation or phase to another without any hiccups or bumps along the way. A smooth transition can be achieved through careful planning, preparation, communication, and execution of steps needed for the change. This phrase is often used in various contexts such as when referring to a successful handover between two teams, a gradual shift from one leader to another, an easy adjustment period during a merger or acquisition, or a seamless switch from one system to another without any glitches.