Sindarin is the Elvish language spoken widely in J.R.R. Tolkien’s Middle-earth.
Tolkien based Sindarin’s sound and historical development mainly on Welsh, one of the languages that influenced his invented-language work. In the fictional history, it developed among the Sindar, or Grey Elves, in Beleriand.
During the Third Age, Sindarin was commonly used by Elves in Middle-earth and was also known to some Men. Many names in The Lord of the Rings, including Aragorn, Legolas, and Rivendell-related terminology, come from or reflect Tolkien’s Elvish languages.
Sindarin is often confused with Quenya, another major Elvish language. Quenya has a more classical and formal role in Tolkien’s mythology, while Sindarin became the everyday Elvish language in much of Middle-earth.