Stellar was born in 2014 as an offshoot of Ripple because Jed McCaleb, the co-founder, had philosophical differences with the rest of the Ripple board. While Ripple is focused on providing solutions to banks, Stellar aims to help facilitate payments between people. While they work in a similar fashion, Stellar is sort of like a “bottom-up” approach compard to Ripple’s “top-down”.
Stellar Lumens are the currency used by the Stellar network, and when the network was started 100 billion Lumens (XLM) were created. A transaction using Lumens costs just .0001 XLM, worth a small fraction of a penny, and usually takes less than 6 seconds to be settled. The supply of Stellar Lumens grows about 1% annually.