This document attempts to be a high-level view of the architecture of the World Wide Web. It is not a definitive complete explanation, but it tries to enumerate the architectural decisions, which have been made, show how they are related, and give references to more detailed material for those interested. Necessarily, from 50000 feet, large things seem to get a small mention. It is architecture, then, in the sense of how things hopefully will fit together. I have resisted the urge, and requests, to try to write an architecture for a long time: This was from a feeling that a dead and therefore less valuable document must any attempt to select which, of all the living ideas, seem most stable, logically connected and essential. So we should recognize that while it might be slowly changing, this is also a living document. The document is written for those who are technically aware or intend soon to be, so it sparse and heavy on explanation in terms of terms.