A screen reader is a software application that helps individuals with visual impairments access digital content. It converts text displayed on a screen into synthesized speech or braille, allowing users to hear or feel the information. Screen readers can read aloud web pages, documents, and emails, making technology more accessible. These tools work with various operating systems and devices, including computers, smartphones, and tablets. Popular screen readers include JAWS, NVDA, and VoiceOver. They enable users to navigate through menus, read text, and interact with applications, promoting independence and inclusivity in the digital world.