What is the concept of wormhole?

Could you please elaborate on the concept of a wormhole? I'm particularly interested in understanding its theoretical framework and any potential applications it may have in the realm of physics or cosmology. Is it possible for a wormhole to exist in our universe, and if so, what might be the conditions for its formation? Additionally, how does the theory of wormholes intersect with other areas of science, such as quantum mechanics or relativity? I'm eager to gain a deeper understanding of this fascinating concept.