Chain linking is a process in which two or more blockchains are connected together. This allows for the transfer of data and assets between the different blockchains. Chain linking can be used to create a larger, more secure, and more efficient blockchain network. It can also be used to facilitate cross-chain transactions, allowing users to move assets between different blockchains. Chain linking can also be used to create interoperability between different blockchains, allowing them to communicate and interact with each other.