LBRY is an open-source "fat" protocol, providing decentralized content discovery and distribution.
LBRY is the first digital marketplace to be controlled by the market’s participants rather than a corporation or other 3rd-party. It is the most open, fair, and efficient marketplace for digital goods ever created, with an incentive design encouraging it to become the most complete.
At the highest level, LBRY does something extraordinarily simple. LBRY creates an association between a unique name and a piece of digital content, such as a movie, book, or game. This is similar to the domain name system that you are most likely using to access this very post.
It might be easier to start with what LBRY is not: it is not just another corporate media service like YouTube or iTunes or Spotify. It is first and foremost a new protocol that allows artists to upload their content to a network of hosts (like BitTorrent) and set a price per stream or download (like iTunes) or give it away for free (like YouTube without ads). What makes this all possible is the blockchain technology developed by the founder of Bitcoin.