What is wormhole.

 A wormhole is a theoretical concept in physics that proposes a shortcut or a tunnel-like connection between two separate points in spacetime. It is often depicted as a hypothetical "shortcut" through the fabric of the universe, connecting distant regions that would otherwise be far apart or even in different universes or dimensions.

According to the theory of general relativity, which describes the force of gravity and the curvature of spacetime, wormholes could exist as solutions to Einstein's field equations. They are thought to arise from the extreme warping of spacetime caused by massive objects or intense gravitational fields.

There are two main types of wormholes: traversable and non-traversable. Traversable wormholes, as the name suggests, would allow matter and information to pass through them. These wormholes could potentially serve as shortcuts for interstellar travel or even time travel, although their stability and practicality are still purely speculative and subject to ongoing scientific research.

On the other hand, non-traversable wormholes, also known as Einstein-Rosen bridges, are theoretical constructs that exist only on paper. They represent a "topological feature" of spacetime but cannot be traversed or used for practical purposes.

It's important to note that while wormholes are an intriguing concept in theoretical physics, there is currently no empirical evidence to support their existence. They remain purely speculative and the subject of ongoing scientific study and exploration.