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dat is a peer-to-peer system for distributing large files, such as operating system images or scientific data sets. The datserver app creates an instance of hypercored, which can then be used to host dat files on your server, ensuring that they're always available to download.

dat is preferable to older ways of distributing files, such as ftp, because files are content addressable and can be seeded on multiple machines to provide greater speed and robustness. It also works nicely with the Beaker browser.