1) Assistive technology 
A screen reader is a software application that attempts to identify and interpret what is being displayed on the screen (or, more accurately, sent to standard output, whether a video monitor is present or not). This interpretation is then re-presented to the user with text-to-speech, sound icons, or a Braille output device. Screen readers are a fo...
Software used to echo text on a computer screen to audio output, often used by people who are blind, with visual impairments, or with learning disabilities.