When you cut an image from Vinyl with your Cricut the image stays attached to the backing sheet. You need to transfer that image from the backing sheet to your project. Since most things you cut with your Cricut contain more than one piece, you don't want to pick up each piece individually and stick it to your project. This is where transfer tape comes in. It is a clear sheet of tape that you adhere to the top of your cut-out image. You then peel the image from the backing sheet and attach it to your project. When the vinyl is stuck to your final project, peel away the transfer tape.