Original: In his fictional universe, the tengwar were invented by the Elf FÃ "anor, and used first to write the Elven tongues: Quenya, Telerin, and also Valarin. Later a great number of languages of Middle-earth were written using the tengwar, including Sindarin.
Simplified: The tengwar are used to write some of Tolkien's constructed languages, like for example the elven languages Quenya and Sindarin.