> For the complete documentation index, see [llms.txt](https://docs.symbiosis.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.symbiosis.finance/main-concepts.md).

# Main concepts

- [Symbiosis sTokens and Supported Chains](https://docs.symbiosis.finance/main-concepts/wrapped-tokens.md): The Symbiosis protocol leverages sTokens, a form of wrapped tokens, to enable cross-chain operations. Discover more about sUSDC, sUSDT, sWETH, and sWBTC in this comprehensive document.
- [Symbiosis: Cross-Chain Swaps](https://docs.symbiosis.finance/main-concepts/symbiosis-cross-chain-swaps.md): Discover the concepts of seamless and secure cross-chain swapping and bridging capabilities offered by the Symbiosis protocol.
- [Symbiosis as Interchain Communication Protocol](https://docs.symbiosis.finance/main-concepts/symbiosis-as-interchain-communication-protocol.md): Interchain communicating messaging with Symbiosis: Add any asset from one blockchain to a third-party protocol on a target chain using Symbiosis cross-chain zaps.
- [Symbiosis & Fees](https://docs.symbiosis.finance/main-concepts/symbiosis-and-fees.md): Who and how pays transaction fees for cross-chain operations conducted with the Symbiosis protocol.
- [Security Audits](https://docs.symbiosis.finance/main-concepts/security-audits.md): A collection of security audits done for the Symbiosis protocol.


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