What language is the Elvish language from "The Lord of the Rings" based on, and who created it?

Overall, the Elvish languages of Middle-earth are a brilliant example of J.R.R. Tolkien's linguistic expertise and dedication to his fictional world. The intricate details of these languages showcase how a fictional universe can come alive through language and deepen the reader's immersion into the story. They also demonstrate the profound influence that real-world languages and mythologies can have on the creation of a writer's imagination.