A piece of data from a website that is stored within a user’s web browser. This data helps the helps the website remember information about your visit.
Cookies include information like passwords, user preferences, previously enabled settings, etc.
For example, you may visit an eCommerce site, browsing through certain products without making a purchase. The next time you visit the site, it might show you the previous items you added in your shopping cart & even recommend products based on your previous searches.
Cookie helps in behavioral targeting & advertisers can use them to show people ads that match their interests.