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

# Atsign Platform

- [Atsign Platform Overview](https://docs.atsign.com/atsign-platform/core.md): An overview of Atsign's core pillars of technology
- [Atsign](https://docs.atsign.com/atsign-platform/atsign.md): A unique identifier which serves as the address of the atServer
- [Atsign](https://docs.atsign.com/atsign-platform/atsign/atsign.md): Learn about what an Atsign is
- [atKeys](https://docs.atsign.com/atsign-platform/atsign/atkeys.md): The file that contains the set of cryptographic keys belonging to an Atsign.
- [Onboarding](https://docs.atsign.com/atsign-platform/atsign/onboarding.md): Onboarding is also known as activation
- [Enrollments](https://docs.atsign.com/atsign-platform/atsign/enrollments.md): Learn about what enrollments are in the platform and their capabilities
- [atDirectory](https://docs.atsign.com/atsign-platform/atdirectory.md): Learn about what the atDirectory is and how it works with other components on the platform.
- [atServer](https://docs.atsign.com/atsign-platform/atserver.md): Learn about what an atServer is at a high-level
- [atServer](https://docs.atsign.com/atsign-platform/atserver/atserver.md): The atServer is one of the most important parts of the Atsign Platform.
- [AtRecords](https://docs.atsign.com/atsign-platform/atserver/atrecords.md): AtRecords are data records stored in atServers.
- [Events](https://docs.atsign.com/atsign-platform/atserver/events.md): Events are the primary mechanism for real-time communication between Atsigns.
- [Namespaces](https://docs.atsign.com/atsign-platform/atserver/namespaces.md): Learn about namespaces in the platform and what aspects of the platform concern them most
- [SDKs](https://docs.atsign.com/atsign-platform/sdks.md): Learn about Atsign's SDKs and developer presence
- [Atsign Protocol](https://docs.atsign.com/atsign-platform/atsign-protocol.md): The protocol that defines client-to-atServer and atServer-to-atServer communication.
- [Frequently Asked Questions](https://docs.atsign.com/atsign-platform/frequently-asked-questions.md)