Holographic overlays are a type of security film used primarily to enhance the security of documents such as ID cards, credit cards, driver's licenses. These overlays consist of a transparent film layer with special holographic effects and patterns. These effects can be visible from specific angles due to light reflection and refraction, and they are applied onto documents to prevent counterfeiting.

Holographic overlays are designed to make it difficult to create counterfeit copies of documents and prevent document fraud. It usually includes customized holograms or patterns, enhancing security on the document. Additionally, when applied to a document, they aid in easily identifying authenticity and reducing the use of counterfeit documents.