What are the differences between Cache object and Application object ?

Sno	Application	Cache
1	Life of Application objects are till the end of Application unless you destroy it.	Also provides application-wide scope but get destroyed by expiration mechanism.
2	You have Locking mechanism in Application object	Not available.
3	Not available.	Has a feature called SQL Cache dependency using which you can invalidate a cache object based on the changes to its source in the table