Captioned telephone service is a communication tool designed for individuals who are deaf or hard of hearing. It allows users to make phone calls while simultaneously reading real-time captions of the conversation on a screen. This service helps bridge the gap in communication by providing visual text of what the other person is saying. The captions are generated by a trained operator or through automated speech recognition technology. Users can read the captions while listening to the audio, making it easier to follow conversations. This service is often used in conjunction with traditional telephones or specialized devices, enhancing accessibility for those who need it.