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rajesh k 10rajesh k 10 

what is the use of custom components in salesforce?

Assuming you are talking about Visualforce components, these allow you to encapsulate Visualforce for re-use across a number of pages, much like you would put code into methods to allow it to be executed from multiple places.  They also allow for straightforward functional decomposition, to break up a huge Visualforce page into manageable chunks.