John Palmer has an online book at www.howtobrew.com.
If you click on "SITE MAP" after entering the site, one of the first things in the book is a glossary that should clear a lot of things up.
And, as always, people here are friendly and willing to clear up confusion or give you definitions.
"Racking" is the process of moving the liquid from one container to the other (normally by siphoning.) I just looked, and Palmer doesn't have that term in his glossary... strange.