A label is a tag attached with an adhesive, used for the purpose of identifying an object or its contents. Labels can come in several forms and can be distinguished by the kind of stock (base material) that they are printed upon, or by the adhesive that they use. The most common type of label is prepared with a paper stock and is colloquially called a sticker. Labels have several uses, from name tags to the identification of products.

The stock types include litho, which is a common base stock; latex, which is litho with added latex that allows it to be more flexible and convenient to use around curved objects; foil, which has the properties of a metal foil; and thermal, which has the ability to change color (generally black) upon heating. Also, there are various plastics including vinyl, acetate, and Mylar that allow for an array of features, like higher strength, transparency, flexibility, etc.

The adhesive types are either permanent, which cannot be removed without ripping the stocks or through the use of solvents; removable, which can be removed without tearing the base stock; semi-permanent, which takes a good 48-72 hours to properly stick, and can be removed and used again if placed incorrectly; and freezer permanent, which remains permanent even in freezing conditions.

Other types of labels include piggyback labels that are prepared by combining two layers of adhesive substrate. This is generally used in Express mail envelopes. Blockout labels are opaque, and cover interiors with an adhesive. Holographic stickers are used for protection against counterfeiting, as well as authentication. They are often used for credit cards, ID cards, CD/DVDs, etc. Radioactive labels are used for chemical elements, and facilitate the tracking of chemical compounds.

Brand stickers are attached to products for identification as coming from a particular company. They are distributed as part of advertising, promotional, and political campaigns. Bumper stickers are used to promote political and religious views and ideas.

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