Hello Sushanth
You can find out more about route reflectors in BGP in general at this lesson:
Now a shadow route reflector, also known as a diverse-path route reflector, is a route reflector that distributes the second best path, also known as the diverse path, to a destination. The purpose of such a setup according to Cisco:
The BGP Diverse Path Using a Diverse-Path Route Reflector feature overcomes the lack of path diversity in an AS containing route reflectors. This feature is meant to provide path diversity within an AS, within a single cluster only. That is, a route reflector is allowed to advertise the diverse path to its client peers only. For each route reflector in the AS, a shadow route reflector is added to distribute the second best path , also known as the diverse path .
You can find out more information about the diverse path route reflector at this Cisco documentation:
I hope this has been helpful!
Laz