Synchronization is nothing but time mapping between QTP and application.synchronization point to give waiting time to the tool(QTP)
Example flight reservation:
1) You are inserting an order and than stop your recording remember not to close or do any other operation after that.
2)Now playback the same test You find it QTP test result is generated before order is inserted.
That shows QTP test execution speed is higher than Application execution speed.
By providing synchronization point tester tries to match the execution speed of QTP and Application because it may happen that the next operation that you are performing is depending on previous result and it is not generated yet.
Default wait time for any object is 20 second and object is not appearing in 20 second than that may fail script. So to avoid such condition we use Synchronization Points
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