Decentralized finance, or DeFi, is a new buzzword popular with fans of cryptocurrencies such as BitCoin.
It's seen as a way to invest in new startups or put money to work by lending out dormant crypto to eager customers.
According to Gizmodo, the YAM token is a cryptocurrency that was originally designed to do nothing and be completely valueless.
Founder Brock Elmore says the YAM token is supposed to be a 'minimally viable monetary experiment.