Tengwar is the script J.R.R. Tolkien created for many Elvish writings. It is a writing system rather than a language, and Tolkien designed it to represent several languages in his legendarium.
In Tolkien’s internal history, the Tengwar were devised by Fëanor in the First Age. They became especially associated with the Elves of Valinor and later spread to other peoples. The script can be used for languages including Quenya and Sindarin, although the spelling conventions vary according to the language being written.
Tengwar letters are called tehtar in some writing traditions when vowel marks are used above or below the main characters. Tolkien presented the system with detailed historical development, reflecting his interest in how real writing systems change over time.
Tengwar is often confused with Cirth, another Tolkien-created script. Cirth consists primarily of angular runes and was strongly associated with Dwarves, though other peoples also used it. Sarati was an earlier script in Tolkien’s invented history, so it is not the same system.