# Application Chains An application chain, also known as an AppLayer™, are blockchains built using AppLayer's Blockchain Development Kit (BDK) and are deployed on AppLayer's Chain Abstraction Layer. An AppLayer™ primarily enables developers to create a chain dedicated to a particular application, with the chain’s rules tailored to the security, performance, speed, decentralization and other service delivery needs of the application. These AppLayers are responsible for securing their own ledger of accounts and balances along with their own execution. AppLayer's BDK currently supports C++ and Solidity for development with plans for other languages such as Rust, C#, Golang, and more. These application chains compile to a binary to enable efficient execution in parallel to Solidity byte code. Additionally, whoever sets up an application chain is in charge of validating the transactions on it and attracting others to run validators. --- # 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.applayer.com/testnet/how-applayer-works/appchains.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.