Facebook Page Name vs. Facebook Page Username

In Facebook page marketing, I see lots of confusion about the difference between the page name and the username (which sets the vanity URL associated with a business page).  Here is an illustrated screen shot, with a tutorial video following, which explains the difference between the two, and describes why understanding this is such a critical foundation to have in formulating an effective Facebook page marketing strategy.

Facebook Page Name vs Username

Video explaining the difference and showing you where you change/set the page name and username in the Facebook page manager: