What is a bridge between two networks?

I'm curious, could you elaborate on what exactly a bridge between two networks signifies? In the realm of cryptocurrency and finance, I've heard this term used frequently, but I'm still somewhat hazy on its specific purpose and functionality. Is it simply a connector that allows for the seamless exchange of information or assets between two distinct networks? Or does it serve a more complex role, perhaps facilitating cross-chain transactions or enabling interoperability between various blockchain platforms? I'd appreciate it if you could break it down for me in layman's terms.