Some surfaces need to remain clean. We simply can't use any type of glue on them, as we can't imagine having to scrape off the residue after removing the sticker. Glueless labels easily stick to smooth surfaces, without leaving any trace after peeling off.
Thanks to the intermolecular attraction, the stickers adhere to smooth surfaces and stay there, until you decide otherwise. They can be applied multiple times and easily removed. These properties give adhesive stickers a very wide range of applications. Not only they are great for short-term advertising campaigns, but also as labels for appliances or warnings on TV screens.