Stellar operates a network with the blockchain technology behind bitcoin. But unlike the popular digital currency, Stellar’s transactions settle in 2 to 5 seconds and allows users to quickly exchange government-backed currencies, such as turning U.S. dollars into euros, according to its website. Stellar’s coins are officially called lumens, or XLM.
https://www.cnbc.com/2018/01/02/theres-a-new-hottest-coin-of-2018-so-far-stellar.html