Bitcoin is a crypto-currency born from the mind of the mysterious programmer Satoshi Nakamoto in 2009. The goals of Bitcoin are to be: easy, secure, decentralized, anonymous and self-regulating. In the past it was pretty uncommon but nowadays it is gaining more and more weight as a currency. Many stores are starting to accept Bitcoins and you can even find them in real life if you are lucky.
I have written in the past about OpenBazaar: a decentralised, free, P2P open market that allow ordinary people and vendors alike to sell online without the need of a centralised market like eBay or Amazon.
IPFS, the InterPlanetary FileSystem, is a distributed, peer-to-peer, decentralized file system that aims to connect all devices under the same inter-connected filesystem using a distributed model (like BitTorrent or Bitcoin) and a versioning system (like Git)....