Wikipedia
ZeroNet is a decentralized Internet-like network of peer-to-peer users. It is based in Budapest, Hungary; is built in Python; and fully open source. Sites have specific "ZeroNet URL"s which can be accessed through an ordinary webbrowser when using the ZeroNet application, which acts as a local webhost for such pages. ZeroNet is not anonymous by default, but users can hide their IP address by using the built in Tor-functionality. ZeroNet uses bitcoin cryptography and the BitTorrent network. The BitTorrent website Play hosts a controversial magnet link repository on ZeroNet, which links to copyrighted content. There is a Reddit community which offers support for ZeroNet.
The existence of peer-to-peer online web-sites had been hypothesised for some time, with The Pirate Bay suggesting they would build a network, as well as BitTorrent Inc. which created the closed source Project Maelstrom. One other similar project is the SAFE Network by MaidSafe, though it has not yet seen widespread use, and has been said to focus more on file storage.
there is no way to take down a ZeroNet page which still has seeders, thus making such pages immune to DMCA takedown notices. In March 2016 it operated with a max-filesize per website of 10 megabytes, suitable for blogs, forums, and smaller torrent-sites.