Litecoin (LTC) - provides faster transaction confirmations (2.5 minutes on average) and uses a memory-hard, scrypt-based mining proof-of-work algorithm to target the regular computers and GPUs most people already have - which are its main differentials to Bitcoin. The Litecoin network is scheduled to produce 84 million currency units with a halving in reward every four years just like bitcoin. The coin was created by a Google employee, Charles Lee. Litecoin is in second spot to Bitcoin and has spawned numerous clones - however it has a solid base of support and dedicated development team.
The Litecoin project is currently maintained by a core group of 6 software developers, led by Charles Lee, with a large community that is growing in support.
In May 2017, Litecoin became the first of the Top 5 (By Market Cap) cryptocurrencies to implement the SegWit scaling solution. Later in May of the same year, the first Lightning Network transaction was completed through litecoin, transferring 0.00000001 LTC from Zurich to San Francisco in under one second.
Official website: https://litecoin.org/