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

# Core Concepts

- [Overview](https://circular-protocol.gitbook.io/circular-protocol-documentation/core-concepts/overview.md)
- [Certificates](https://circular-protocol.gitbook.io/circular-protocol-documentation/core-concepts/certificates.md): Certificates are verifiable records that prove an action or data is authentic, timestamped, and tamper-proof, enabling trusted collaboration and audibility across regulated industries.