Shreyas,
I notice you recently joined SCN community. Welcome aboard!
If you had read the rules of engagement, you would have noted that it is a REQUIREMENT to perform searches before actually posting a question. The question you asked in this post has been asked and discussed countless times. In addition, there are substantial amounts of information about this topic freely available in help.sap.com, and many other places on the Internet.
Here is a link to the rules of engagement:
Here are some links which will help sharpen you searching skills:
Search is a Tool: Tips for Better Results
Custom Google Search for the New SCN
If, after performing your searches, you still have specific questions about specific topics (FYI CRP is a very general topic), then feel free to come back with your questions!
Best Regards,
DB49