BLD and BLP can you explain the difference

BLP = Number of links pointing to a specific locaton or URL in my site - this can be inner pages or special sections and from any Do follow source or website right?

BLD = Number of links pointing to my domain as the main domain ie mysite.com only?

Is that right?

So when I make a purchase of links from here and point them to a specific page or department on my site these will show or count as BLP right?

the BLD is the sum of all the backlinks pointing to all the pages of a site

its the site total number of links

thanks