A cookie is a small amount of data generated by a website and saved by your web browser. Its purpose is to remember information about you.
Most web browsers save all cookies in a single file. This file is located in a different directory for each browser and is not meant to be opened manually. Fortunately, most browsers allow you to view your cookies in the browser preferences, typically within the “Privacy” or “Security” tab. Some browsers allow you to delete specific cookies or even prevent cookies from being created. While disallowing cookies in your browser may provide a higher level of privacy, it is not recommended since many websites require cookies to function properly.
NOTE: Since cookies are stored in a different location for each web browser, if you switch browsers, new cookies will need to be created.
See more information at The Tech Terms Dictionary
What Cookies do We Use