Why I should implement DLP and what its important to me ? I dont know ABCD of DLP then how can I think of it and how I should understand and decide to implement it.
Please refre below
https://www-secure.symantec.com/connect/articles/what-protection-does-symantec-dlp-provide-note-beginners
http://www.symantec.com/en/in/data-loss-prevention
https://www-secure.symantec.com/connect/forums/dlp-features
are you end user ?
you may need to cintact Symantec partner or Sales to know the risk associated in leakage of confidential data.
As mentioned above, reach out to your Symantec Sales team or your Symantec Partner to help figure out what's all involved.
You should start w/ a demo and then move to a proof of concept. Unless you've already purchased the product.
Here are some videos me and my company have done: https://vimeo.com/album/1612870