Are commercial DVDs different from homemade ones?

I know that when I burn a DVD in my computer, I’m using a small laser to etch the surface of the disc with a series of pits and lands. Are commercial DVDs created the same way? My boss thinks that they are somehow stamped using a master rather than burned. Is he correct or is there some other way of doing this that we don’t know about?

Howstuffworks.com says:

Actually, when you make a DVD (or a CD) at home, you are not burning in the pits and lands. Pits and lands are only present in commercial, pressed CDs. Home burners cause dye in the data layer to turn dark, thus emulating the function of the pits and lands. This is why recordable CDs and DVDs are not as compatible as the commercial ones (although that’s not much of a problem). Also, little known fact: It’s the transition between the pits and the lands that represents the data, not the actual pits. The transition scatters the light, while both a pit and a land reflect light. Burned discs put dark spots where the transitions would be in a pressed disc.