The so-called "one card" is to realize the intelligent management of many different functions on the same card. Essentially, it is a special information management system composed of cards, appliances and higher-level management software. Its core content is to use cards, a specific physical medium, to realize the standardization and automation of information resource management from the generation, collection, transmission of business data to summary analysis. At the same time, as a part of enterprise information management, enterprise all-in-one card is closely related to enterprise's ERP system, financial system and HR system.

According to the card's media, it is divided into read-only and read-write. The read-only card generally uses the ID number on the card to realize identity authentication, and performs data interaction in the background, such as a magnetic stripe card barcode card, a PVC card with an ID number, and a contactless IC card (RFID radio frequency card) . The read-write card has a wide range of applications. The card can be used as an identity authentication ID and can also be written to the card. The read-write card, that is, the IC card, is divided into contact and non-contact. The non-contact card is today and later. The mainstream. A non-contact IC card is a radio frequency (RFIC) card with a built-in chip. Taking the Philips Mifare card as an example, it consists of multiple read and write sectors that can be encrypted, stored, read, and rewritten. Today's radio frequency card technology has developed to the CPU card stage. In addition to encryption, storage, reading, and rewriting, it also has computing and dynamic encryption functions. CPU cards are the mainstream in the future. The SIM/UIM card of the mobile phone is integrated with the radio frequency technology to form a new medium, that is, the mobile phone card.

The card can be divided into three categories: consumption management applications, identity recognition applications, and energy saving and environmental protection applications. Consumption management applications such as: canteen sales system, member consumption management system, parking lot charging management system, computer room on-board management system, gym management system, library management system, etc.; identification applications such as: access control system, attendance system, Elevator credit card control system, shuttle management system, etc.; energy-saving and environmental protection applications such as: water control management system, temperature control management system, electric control management system, etc.