Whats "TTY" on the iPhone?

If you go to the phone settings on the iPhone nearby is a option call " TTY "......what does this do?

Answers:    TTY (TeleType), also known as Text Telephone Device or Telecommunication Device for the Deaf (TDD), is a special device required at both ends of the conversation that enable people who are deaf, tough of hearing, or speech-impaired to use the headset to communicate. TTY works by allowing people to type messages put money on and forth to one another instead of talking and listen. For using it with iPhone, you obligation iPhone TTY Adapter cable which costs like $19.
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