Text-to-speech converts written text into spoken audio output using AI models. Modern TTS systems produce natural-sounding, expressive speech with appropriate prosody, emotion, and pacing. They power virtual assistants (Siri, Alexa), accessibility tools for visually impaired users, automated phone systems, audiobook narration, and content localization. Neural TTS models like those from ElevenLabs and OpenAI can clone specific voices from short audio samples, enabling personalized experiences.