Counterfeit detection refers to the methods and technologies used to identify fake or imitation products, particularly in industries like currency, luxury goods, and pharmaceuticals. This process often involves examining physical characteristics, such as materials, printing techniques, and security features, to determine authenticity. Various tools and techniques are employed in counterfeit detection, including UV light, holograms, and watermarks. Additionally, advanced technologies like machine learning and blockchain are increasingly being used to enhance the accuracy and efficiency of identifying counterfeit items, ensuring consumer safety and protecting brand integrity.