Litecoin (LTC), is a cryptocurrency that at first glance, is very similar to Bitcoin. While the function is the same, i.e., making secure transactions, there are other differences. Coindesk wrote an excellent article comparing Bitcoin vs. litecoin.
Behind Litecoin there are two different groups which push the project forward. The first one is the Litecoin Foundation, which is a non-profit organization from Singapore with a goal to promote blockchain technology and advance Litecoin for the good of society.
The second one is the Litecoin Core Development Team, i.e., the people behind the Core software used by miners, users, companies. They make sure that everything is secure, encrypted, and that new features are being developed.
Official Website: https://litecoin.com