What do wormholes do?

Could you please explain what the function of wormholes is? I've heard they have something to do with the concept of spacetime, but I'm not entirely clear on the specifics. Are they merely a theoretical construct or do they have any practical applications in the realm of physics? Could wormholes potentially serve as a bridge between two distant regions of the universe, allowing for faster-than-light travel? And if so, what are the theoretical limitations or challenges that need to be overcome before we can harness their potential? I'm fascinated by the idea of wormholes and their potential impact on our understanding of the universe. Thank you for clarifying this concept for me.