# What is cross-chain messaging? Cross-chain messaging allows communication between different blockchain networks, passing transaction data, smart contract calls, and other information. This capability is crucial for expanding the blockchain ecosystem and enabling interoperability between different chains. EMC Chain, as the mainnet, can communicate with its Layer 2 solutions as well as other blockchains through cross-chain messaging. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.emc.network/emc-testnet/emc-testnet/cross-chain-messaging/what-is-cross-chain-messaging.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.