An ad blocker is a software tool designed to prevent advertisements from appearing on websites. It works by filtering out ad content, allowing users to browse the internet without interruptions from banners, pop-ups, or video ads. This can lead to a faster browsing experience and reduced data usage. Many people use ad blockers to enhance their online privacy, as some ads track user behavior. Popular ad blockers include extensions for web browsers like Google Chrome and Mozilla Firefox. While they improve user experience, they can also impact website revenue, as many sites rely on ads for funding.