Wikipedia
Litecoin
Litecoin (LTC or Ł) is a peer-to-peer cryptocurrency and open source software project released under the MIT/X11 license. Inspired by and technically nearly identical to bitcoin (BTC), Litecoin creation and transfer is based on an open source protocol and is not managed by any central authority.
After Bitcoin and Ethereum, Litecoin is the third-largest true cryptocurrency by market capitalization.