Pocket is a social bookmarking tool that allows users to save articles, videos, and other content from across the web to their Pocket account to view and manage later. It was created in 2007 by Nathan Weiner under the name Read It Later and has grown to over 7 million users. Pocket can be accessed through browser extensions, apps, and getpocket.com. It is praised for its cross-platform compatibility and integration with other apps but criticized for its lack of social sharing features compared to competitors like Instapaper. Pocket aims to address issues like link-rot and generate revenue over time through premium upgrades and services.