AS

AS

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• Stands for Autonomous System, 自治域
• A very large Computer Network or group of computer network with a single routing policy under the control of one entity (such as a company or ISP).
• Each AS is assigned a unique ASN, which is a number that identifies the AS

BGP

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• Stands for Border Gateway Protocol
• A Network Protocol for routing traffic among AS, each AS is like an isolated Local Area Network (LAN), BGP is the component that connects them together, so the data can flow among different AS

References

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• What is an autonomous system? | What are ASNs? | Cloudflare