Cookies are messages that web servers pass to your web browser when you visit Internet sites. Your browser stores each message in a small file, called
cookie.txt. When you request another page from the server, your browser sends the cookie back to the server. These files typically contain information about your visit to the web page, as well as any information you've volunteered, such as your name and interests.
The term "cookie" is an allusion to a Unix program called Fortune Cookie that produces a different message, or fortune, each time it runs.
Measures taken to protect computers or critical infrastructure.