The key advantage of a stencil is that it can be reused to repeatedly and rapidly produce the same letters or design. Although aerosol or painting stencils can be made for single use, typically they are made with the intention of being reused. To be reusable, they must remain intact after a design is produced and the stencil is removed from the work surface. With some designs, this is done by connecting stencil islands (sections of material that are inside cut-out "holes" in the stencil) to other parts of the stencil with bridges (narrow sections of material that are not cut out).
Hand stencils, made by blowing pigment over a hand held against a wall, and which were made over 35,000 years ago have been found in Asia and Europe, and later prehistoric dates in other continents.[1][2] After that stenciling has been used as a historic painting technique on all kinds of materials. Stencils may have been used to color cloth for a very long time; the technique probably reached its peak of sophistication in Katazome and other techniques used on silks for clothes during the Edo period in Japan. In Europe, from about 1450 they were commonly used to color old master prints printed in black and white, usually woodcuts.[3] This was especially the case with playing-cards, which continued to be colored by stencil long after most other subjects for prints were left in black and white.[4] Stencils were used for mass publications, as the type did not have to be hand-written.
Stencils are frequently used by official organizations, including the military, utility companies, and governments, to quickly and clearly label objects, vehicles, and locations. Stencils for an official application can be customized, or purchased as individual letters, numbers, and symbols. This allows the user to arrange words, phrases and other labels from one set of templates, unique to the item being labeled. When objects are labeled using a single template alphabet, it makes it easier to identify their affiliation or source.
Stencils have also become popular for graffiti, since stencil art using spray-paint can be produced quickly and easily. These qualities are important for graffiti artists where graffiti is illegal or quasi-legal, depending on the city and stenciling surface. The extensive lettering possible with stencils makes it especially attractive to political artists.
Stencil has lately become intertwined with social activism. Because stencil makes easy to spread message through cityskape as it's easy to apply and is reusable. A good example is Banksy, whose works are world-famous. It is important to emphasise not to damage private property.