Everyday technology guide

Browser cookies explained

Cookies are small pieces of site data browsers store for functions such as sign-in state, preferences, measurement and advertising.

BrowserCookies

Editorial review: August 11, 2026 · Gavin E. Hartwell

Not all cookies do the same job

Some support essential site functions while others are used for analytics or advertising.

Clearing cookies can sign you out

Removing site data may also remove preferences and session information.

Browser privacy controls vary

Use the current browser's privacy and site-data settings rather than old instructions based on a different version.

Cookie choices are one part of privacy

Account security, browser extensions, app permissions and data sharing also matter.

General consumer technology information only. Interfaces and menu names change. Before resets, reinstalls, storage changes or other major actions, verify that important data is backed up and use current manufacturer/service-provider instructions.