Diecut's are cut to the shape of the sticker. For example if you made a Nike, the diecut would only include the Nike symbol, where as a regular sticker would have a clear sticky background.
die cuts are like individual stickers, all on a backing, with a clear sheet on top. so when applying, you peel off the clear part off the backing, and the letters/ logos peel off with it. then you stick that on your helmet or what ever, and peel off the clear top, and everything else stays on.
this is a die cut. all of the letters are separate. a sticker is just one piece. i hope that helped.
die cuts are the kind that have 2 sides and little pieces of vinyl in between. You know you peel off the translucent top then stick it something then peel that off too and it leaves a sticker. A sticker you just peel off the sticker all the parts are connected. Its called a die cut because the die cuts are cut out of sheets of vinyl with this super sharp needle like thing called a die.