Internet cookies, also known as magic cookies, are small pieces of data that websites store on your browser after you visit the site. Cookies can improve your online experience by ensuring you don’t have to enter data like your username and password or your location more than once.
Online advertisers use cookies to track your online browsing habits and history and use this data to create more targeted ads. While this does increase the personal relevance of the ads you see online, some people consider cookie usage a violation of user privacy.
See also: Remarketing, privacy policy
Further reading: Understanding Internet Cookies And What They Do