Wat is Autonomous system, anycast, edge network?

An autonomous system (AS) is a group of IP prefixes run by one or more network operators under a single routing policy, identified by a number in the internet’s routing system. Anycast is the practice of making one service address available in several places at once, so that each packet reaches whichever is nearest in the routing system. An edge network is a provider’s set of points of presence close to users, often reached by anycast, that terminates connections and forwards requests to the origin servers.