Sindarin
Sindarin is a major Elvish language created by J. R. R. Tolkien as part of his Middle-earth legendarium. It is the language of the Grey Elves (Sindar) and became the most widely spoken Elvish tongue in Middle-earth during much of the Second and Third Ages. In the later periods it functioned as a common tongue among Elves and many Men, and it influenced the linguistic landscape of Tolkien’s world.
Origins and development: Sindarin derives from the Common Eldarin branch of Elvish languages and was developed
Writing and pronunciation: Sindarin is typically written with the Tengwar script, one of Tolkien’s Elvish writing
In Tolkien’s writings: Sindarin is spoken by many prominent characters, such as Legolas, Elrond, and Galadriel.