A wormhole is a theoretical passage through space-time that connects two separate points in the universe. It is often depicted as a tunnel with two ends, each located in different regions of space and time. The concept arises from the equations of Albert Einstein's theory of general relativity, suggesting that such structures could exist, although they have not been observed. Wormholes are sometimes referred to as "Einstein-Rosen bridges," named after Einstein and Nathan Rosen, who first proposed the idea in 1935. While they are a popular topic in science fiction, their existence remains purely hypothetical, and significant challenges would need to be overcome to traverse one safely.