Are wormholes legit?

Could you please elaborate on the legitimacy of wormholes in the context of cosmology and theoretical physics? Are they merely hypothetical constructs or do they possess a solid scientific foundation? Have there been any experimental evidences supporting the existence of wormholes? If so, what are the implications of their existence for our understanding of the universe? Furthermore, could you discuss the potential applications of wormholes, if proven to be real, in areas like interstellar travel or inter-dimensional communication? It would be helpful to have a comprehensive yet accessible explanation of this fascinating concept.