# Concepts

These pages define what every Yanez product shares.

- [Identity and Keys](identity.md): the `yid`, bio-derived BLS keys, threshold tiers, addresses, and public key binding.
- [Environments](environments.md): test and production base URLs, deep-link bases, and registration QR codes.
- [Glossary](glossary.md): terms used across the YID partner integration and Pulse docs.

Product-specific concepts:

- [YID partner concepts](../yid/concepts.md): partner accounts, signing keys, and sandbox versus production.
- Pulse: [Terms](../pulse/terms.md), [Receipts](../pulse/receipts.md), [User-signed approvals](../pulse/user-signed-approvals.md), and [Action enforcement](../pulse/action-enforcement.md).