A personalised (or personalized) stamp is a postage stamp on which, for a fee, an image and/or text of the purchaser's choosing may be placed. The stamps vary from country to country, and while some are normal stamps with a personalised label on the left attached by perforations, elsewhere the stamps are more properly regarded as one-piece personalised meter stamps with a colourful design next to the indicia. Stamps produced by Zazzle.com for the United States, for instance, are one-piece, self-adhesive with die cut margins to emulate perforations, and visually very similar to normal United States postage stamps, except for the addition of an information-based indicia (IBI) encoded by little black and white squares along one edge. A serial number appears next to the IBI.