- Wormholes are hypothetical topological features of spacetime that act as shortcuts through space and time, connecting two regions. They consist of two mouths connected by a throat. - Einstein first proposed the concept of wormholes in 1935 as bridges connecting different points in spacetime. However, it was later shown that these bridges would be unstable without exotic matter that violates the null energy condition. - In 1987, Morris and Thorne introduced the concept of traversable wormholes that could theoretically allow travel between different points in the universe if stabilized by exotic matter at the wormhole throat. They provided a simplified theoretical framework and stress-energy scenario for analyzing traversable wormholes.