Text to speech software (also known as TTS software) is software that converts text into audible form – in other words, it will read digital text aloud.
TTS can be used to read aloud PDFs, word docs, websites, or basically anywhere that you find digital text. TTS software comes in many flavours, with different voices, accents, and languages available. TTS options can be standalone products/apps (some paid, some free), but there are also built-in TTS features in many operating systems and browsers.