A privacy filter is a screen accessory that helps protect the information displayed on electronic devices like laptops and tablets. It works by limiting the viewing angle, so only the person directly in front of the screen can see the content clearly. This is especially useful in public places, such as coffee shops or airports, where others might try to glance at your screen. These filters are typically made of thin, lightweight materials and can be easily attached or removed. They are popular among professionals who handle sensitive information, as well as students who want to keep their work private while studying in shared spaces.