Could someone explain what DVD layers are? What difference is there between double and triple layer?

What exactly are layers? Is triple layer WAY better than double? Can you visually see a difference between the amount of layers when played on your TV? Sorry for sounding dumb, but I just don't get it. I burn DVDs at home, but never payed much attention to the layers.Could someone explain what DVD layers are? What difference is there between double and triple layer?
I dont think there is a such thing as a triple layer DVD. A double layer DVD simply holds twice as much data as a single layer DVD by burning a second layer of data over top of the first one at a different depth. The laser inside the DVD player will read all the way through the first layer and refocus to read the second layer. If you watch carefully during a movie you can usually catch this ';layer change'; as a small pause in the movie where the video will lock up for a second. Anyway, the only reason video tends to look better on a double layer DVD is because they had more room to store the movie, so they didn't have to compress it as much. The DVD player doesn't read both layers at the same time like a flashlight shining through a red filter and then a blue filter to make purple light. It just reads one and then the other sequentially. Hope this helps.Could someone explain what DVD layers are? What difference is there between double and triple layer?
I didnt even know there was triple!





regular blank DVDs are 4.7gb





double layer (like the ones that commercial DVD movies are on) are 8 or 8.4gb)





the more data, then the better picture /or longer movie you can put on the DVD
Triple layer? I never have heard of it on dvd's but the layers all it means is how much information can be placed on the disk. The site might be able to help clear things up as well.