Storage is a general term in computing that means keeping data over a period of time. In the context of Web browsers, it has a more specific meaning: Web browsers set aside a limited amount of space on your device, where websites can store data. This is usually called "local storage." Common uses of local storage are to store your settings for the site (such as your dark mode / light mode preferences) and to save work in progress. Some sites may also use local storage to enable limited offline functionality (such as the ability to continue editing a Google doc, even without a Wi-Fi connection).