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This document has moved.
You'll now find information like this in the ipld/ipld meta-repo, and published to the web at https://ipld.io/ .
All documentation, fixtures, specifications, and web content is now gathered into that repo. Please update your links, and direct new contributions there.
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"Content addressability" refers to the ability to refer to content by a trustless identifier.
Rather than referring to content by a string identifier or URL, content addressable systems refer to content by a cryptographic hash. This allows complete decentralization of the content as the identifier does not specify the retrieval method and provides a secure way to verify the content.