What is Interoperability?

As initially designed, many early blockchains couldn't communicate with each other. Interoperability is the ability of various blockchain protocols to work and interact with each other (Bitcoin and Ethereum for example). The ability to send crypto (coins, tokens) and data between chains is a primary goal of interoperability systems that will expand the reach and network effects of the blockchains that can interact with each other. Other features that increase interoperability include wrapped cryptocurrencies, Layer-2 solutions and sidechains, and the ability of smart contracts and decentralized applications (dApps) to communicate between chains.