A substrate chain refers to a type of blockchain that is built using the Substrate framework, which is developed by Parity Technologies. This framework allows developers to create customizable blockchains tailored to specific needs or use cases.Substrate chains are modular, meaning they can include various components, such as consensus algorithms, governance mechanisms, and ecosystem features, based on what the project requires. This flexibility enables quicker deployment and innovation.One key feature of substrate chains is their ability to connect to the Polkadot network, allowing them to communicate and share information with other chains. This interoperability enhances functionality and expands the potential for cross-chain applications.In summary, substrate chains are highly adaptable blockchain solutions that facilitate the development of specialized chains while promoting interconnectedness with other platforms.