Modern business activities are endowed with the function of image display, which can be used to hold all kinds of paper documents, but not limited to this. Materials include PP, PVC and cardboard; Some are imitation leather, cloth noodles, etc. What can be bought in the market is usually the standard A4 document as the object of decoration. There are many types of folders: single-strong folder, double-strong folder, data book, two-inch folder, three-inch folder, double-open folder of different specifications, single-page folder (also called L-type folder), and multi-page folder.

The folder is specially used to hold the whole page of documents. The main purpose is to better save the documents and make them neat and standardized. It is a tool used for the storage, protection and standardized management of paper documents in the process of business or business activities.