Changes

'''TTY''' is a type of machine that allows people with hearing or speech disabilities to communicate over the [[telephone]] using a keyboard and a viewing screen. It is sometimes called a TDD. [[Category:Telecommunications]]

'''TTY''' ('''T'''ele'''TY'''pewriter) is a type of machine that allows people with hearing or speech disabilities to communicate over the [[telephone]] using a keyboard and a viewing screen. It is sometimes called a TDD ('''T'''elecommunications '''D'''evice for the '''D'''eaf). [[Category:Telecommunications]]