synchronization point is nothing but time interface between 
tool and application build.generally we r giving
synchronization point to give waiting time to the tool.
3 ways we can do this.i.e 
1-synchronization point: here we r giving waiting time to the
tool depending on application status bar.suppose in yahoo
regiistration form after fillup when click on submit after
colour filling the status bar it will go to next page.if we
r not giving synchtonization point when tool execute the
next page script it show an error page not found.
navigation:insert menu-step-synchronizatiobn point
2-wait():here we r giving fixed waiting to the tool
3-increasing time out:bdefault QTP maintains 20000
milisecond to identify object.if it is taking more time to
identify all the objects then we hav to increase the time out.
navigation:tool-option-run tab increase our time there in ms.

Hi, Latin.
I have one more doubt....
what is the main use of using Synchronization?????


We use it for giving waiting time only or any other 
purpose????????

Kindly, tell me

Thanks in Advance3

Waiting time in the sense that if you have an application in
which you have 3 steps for example.
Let's say you are recording the steps where the first step
is to enter the information, second step is clicking submit
 button and third step is printing the summary page.

Now when you click submit button it may take few seconds to
several minutes depending on the application or internet
speed.After your summary page has loaded you click print.

But when you play this in Qtp it does it very fast,it does
not wait for processing of information after you click
submit button and may try to print summary page which will
give error.
So, to overcome such problems we insert synchronization
point.By inserting synchronization point we are asking QTP
to wait till Summary page is loaded and then click Print button.

HI Radhika, 
Thanks for ur answer
and i have one more doubt
We have wait option to wait the application right????
Instead of using synchronization, can we use wait 
function???

Wait() is used when you want QTP to wait for specified time
whereas synchronization is used when you want QTP to wait
till certain process is completed or event has occured.

Wait(n) statement waits for specified 'n' seconds even
though process has occured in less than n seconds whereas
when using sync statement ,QTP resumes/moves to next step as
soon as event has without wasting time.

There is another similar option called exist(n) which waits
for an object (like button to be activated) or waits till
'n' seconds whichever is earlier.