“Pie in the sky” is a phrase that refers to something that is overly optimistic, idealistic, or unrealistic. It describes a situation, idea, or promise that seems appealing or desirable, but is unlikely to happen or be achieved in reality.

The term often implies that the object or goal being described is too far-fetched or impractical to become a reality. It may involve unrealistic expectations or grandiose plans that are not grounded in practicality or feasibility.