# The Semantic Web

A web of machine-readable meaning where software agents can act on data, not just display it — the bridge toward Web 4.0.

The **Semantic Web** is the idea that web content should carry structured, machine-readable meaning so that software agents can reason and act on it, rather than merely rendering pages for humans.

## Origin

Articulated for a broad audience by [Berners-Lee](/wiki/berners-lee.md) and colleagues in the 2001 [Scientific American article](/docs/semantic-web.md), it extended the original Web from documents-for-people toward data-for-machines.

## Why it matters here

The Semantic Web is the bridge era between the read-write web and the Independent Internet. As agents increasingly read and act across the web, the unanswered question becomes *control*: who owns the compute and data those agents touch. Web 4.0 adds that axis to the [decentralization](/wiki/decentralization.md) story.

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## Backlinks

Pages that link here:

- [The Semantic Web](/docs/semantic-web.md) — Berners-Lee, Hendler, and Lassila's vision of a machine-readable web of meaning — the 'Read-Write-Own' turn.
- [Agent-Readable Web Standards](/wiki/agent-readable-web-standards.md) — A family of plain-text conventions at well-known paths that let machine readers understand how a site or repository wants to be read — the protocol surface of the Independent Internet.
- [Tim Berners-Lee](/wiki/berners-lee.md) — Inventor of the World Wide Web and advocate for a decentralized, machine-readable, user-controlled web.
- [Compounding Knowledge vs. Retrieval](/wiki/compounding-knowledge-vs-rag.md) — Why an LLM-maintained wiki accumulates understanding where retrieval-augmented generation re-derives it on every query.
- [Glossary](/wiki/glossary.md) — Formal definitions of the key terms behind the Independent Internet and Web 4.0, as used across this wiki, with links to source material.
- [Information Management: A Proposal](/wiki/information-management-proposal.md) — Berners-Lee's CERN memo proposing a decentralized web of typed nodes and links — the document the World Wide Web grew from.
- [LLM-Maintained Wiki](/wiki/llm-maintained-wiki.md) — A persistent, interlinked knowledge base that a language model builds and maintains — integrating each source once, rather than re-deriving answers from raw documents on every query.
- [llms.txt](/wiki/llms-txt.md) — A proposed standard for a curated, LLM-shaped manifest at a site's root — telling language models what to read at inference time.
- [Independent Internet (Web 4.0)](/wiki/web4.md) — The web forgot who it was for. Web 4.0 — the Independent Internet — is a resilient, self-hosted internet people own and control. Explore the research.