What does bridging two networks do?

I'm curious to understand the significance of bridging two networks. Could you elaborate on what it actually accomplishes? I've heard it mentioned in the context of blockchain and cryptocurrencies, but I'm still a bit hazy on the details. Does bridging enable seamless transactions between different blockchains? Or is it more about enhancing interoperability and connectivity? Also, are there any specific challenges or considerations that need to be taken into account when bridging two networks? I'm eager to gain a deeper understanding of this concept.