Non-Persistent cookies are otherwise called as temporary cookies.They are active as long as the browser remails active.They are also called as session based cookies.Once the browser is closed the cookies vanishes automatically. While Persistent cookies are permanent cookies.They are stored as a text file in the hard disk of the computer.

The non persistent cookies are in-memory cookies which are are added to the memory of browser but not recorded in any file and does not stored on the client's HD.

Adding the expiration time to the non persistent cookie to persistent cookie.

The persistent cookies are stored onto the client's HD.

persistent cookies are stored in client's hard disk.

non-persistent cokies are stored in browser processer in tempararily. its also called inmemory cokies.