Adblock

Adblock refers to a class of software tools designed to block or filter online advertisements. These tools aim to improve page load times, reduce data usage, and protect user privacy by preventing ads and trackers from loading.

Most widespread form is a browser extension that intercepts HTTP requests and modifies page content according to filter rules. In practice, adblocking is accomplished by blocking requests to known ad networks, hiding ad containers, or stripping scripts that load ads. Many adblockers rely on filter lists—maintained by communities—that specify patterns for URLs, domains, resource types, or CSS selectors. The most widely used lists include EasyList and EasyPrivacy, updated frequently to reflect changes in advertising techniques.

Adblocking can also be implemented at the network level, such as on a home router or DNS resolver, to block ads across multiple devices. Mobile apps and some routers offer similar functionality, often with configurable whitelists.

The presence of adblocking affects publishers and advertisers by reducing revenue from ads; this has led to discussions about alternative monetization and "acceptable ads" programs, whitelists, or anti-adblock measures on sites. While adblockers improve privacy by blocking trackers, they can also block legitimate content if misconfigured. Most modern adblockers allow users to customize filters and exceptions.

Future developments continue as advertising practices and user privacy expectations shape how adblocking tools develop and integrate with browsers and devices.