Philatelic errors refer to mistakes that occur during the production of postage stamps. These errors can include misprints, color variations, or incorrect designs. Collectors often seek out these unique stamps because they can be rare and valuable, making them an interesting aspect of the philately hobby. Common types of philatelic errors include inverted images, missing colors, and double impressions. For example, the famous Inverted Jenny stamp features an upside-down airplane, which has become one of the most sought-after errors in stamp collecting. Such mistakes can significantly increase a stamp's worth and appeal to collectors worldwide.