Persistence

One of the most critical tasks that applications have to perform is to save and restore data. Whether it be a word processing application that saves documents to disk, a utility that remembers its configuration for next time, or a game that sets aside world domination for the night, the ability to store data and later retrieve it is a vital one. Without it, software would be little more effective that the typewriter - users would have to re-type the data to make further modifications once the application exits.

Therefore, an object that has the ability to store and remember values is often said to have persistence. For Example, the ability of your car radio to remember your list of favorite stations is often referred to as persistence.

It also can be defined as the property of an object by which its existence transcends time(i.e., the object continues to exist after its creator ceases to exists) and/or space (i.e., the object's locations moves from the address space in which it was created).