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

# Key Concepts

- [Decentralized Identity](https://sending-network.gitbook.io/sending.network/network-instructional-articles/key-concepts/decentralized-identity.md): An Introduction to SendingNetwork’s Decentralized Identifier System
- [Social Graphs](https://sending-network.gitbook.io/sending.network/network-instructional-articles/key-concepts/social-graphs.md): An Introduction to Sending.Network’s NFT-based Group Relations
- [Edge Node](https://sending-network.gitbook.io/sending.network/network-instructional-articles/key-concepts/edge-node.md): An Introduction to Edge Network