A cookie is a file downloaded on to your computer when you access certain websites. Cookies enable websites (among other things) to storage and recover information about users or devices browsing habits and, depending on the information they contain and the way you use your device, they can be used to identify the user.
The user’s browser stores cookies on the hard disk only during the current session, so they take a minimal amount of memory space and they do not damage the PC. Cookies do not contain any kind of specific personal information and most of them are wiped out of the hard disk when the browser session is over (the so-called session cookies).
Most browsers accept cookies as standard and, independently of them, they allow or impede temporary or memorized cookies on the security settings.