A Parent Chain refers to the original blockchain from which a sidechain or another blockchain derives. It holds the primary transaction history and network consensus that other chains may depend on or interact with.In a multi-chain ecosystem, the Parent Chain can facilitate transactions and maintain security while allowing other chains to operate independently. These other chains, often called child chains or sidechains, can customize features and functionalities without affecting the main chain.The interaction between a Parent Chain and its child chains usually involves transferring assets or data. This process allows for greater flexibility and scalability, as transactions can be processed off the main chain, reducing congestion.Overall, the concept of a Parent Chain is crucial for enhancing blockchain interoperability and efficiency, ensuring that different chains can communicate and function cohesively while retaining their unique attributes.