Credit Default Swap Queries

Hey Guys!

Can anyone explain the following terms in detail with example used in CDS valuation - Par spread/Quoted spread/Recovery risk?

And also how the credit spread curve is used in deriving valuation?

Thank You.

https://www.markit.com/cds/announcements/resource/cds_big_bang.pdf

I recommend reading this. Page 19 explains the quoting conventions.