Definitions for "Persistent cookie"
Keywords:  cookie, drive, hard, deleted, expired
a cookie which remains on the user's hard drive until the user erases it.
This is a cookie which is written to a file on the user's system. Persistent cookies files are often accessible over the Internet through certain queries to search engines. If such a cookie contains an authenticator, an adversary can simply copy the cookie and break into the user's account. In addition, if the account is accessed from a public system, any subsequent user of that system can access the account. As a result, persistent cookies should not be considered private and authenticators should not be stored in them.
a cookie that has been assigned an expiration value