Differences between PST & OST?

PST :

* PST is a personal folders we create PST For moving mails from mailbox to local Computer.

* PST Files is Simply a Storage Location on Your HDD or Server than the Exchange Server.

OST :

* OST created when the outlook is offline

* OST Files Starts as a mirror image of your Folders on your Exchange Server and works In conjunction with Exchange Server During Synchronization.