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what is <apex:detail> tag ? why it is used ?

Hi Ajju, you need to spend some time looking over the training materials we have on this site.
Hi Ajay, 

The standard detail page for a particular object, as defined by the associated page layout for the object in Setup.

This component includes attributes for including or excluding the associated related lists, related list hover links, and title bar that appear in the standard Salesforce application interface.

See the image in the below link, which shows the detail part of a salesforce recod and how it can be customized.

Main doc: apex:detail Class and its avaialble attributes that can be edited in a visualforce page.