A seamless transition refers to a smooth and uninterrupted change from one thing to another, without any gaps or breaks. It suggests that the shift is so well-executed that it appears effortless and natural, with no visible interruption in the flow of events or continuity of experience. The term can be used in various contexts such as describing a smooth handover between two speakers during an event, a seamless transition from one scene to another in a movie, or a seemingly unnoticeable change in technology or software upgrades. Overall, the phrase "seamless transition" implies that the change has been executed so well that it goes unnoticed and appears as if there was no break in continuity.