Access control everyone will contact in daily life. Our most common lock key also belongs to access control. However, with the development of electronic technology and network technology, access control has developed into a complete access management system. Access control system not only plays a role in access security control, but also plays an important role in administrative management and personnel attendance. The access control system can be divided into password access control system, card access control system and biological access control system according to the identification method. 1ã Password access control system password access control system is more traditional. As long as you enter the correct password, the door will be opened and released. This identification method has the lowest cost, as long as you remember the password, which is its advantage. However, this identification method is not very convenient to use, because it takes time to enter the password. If there are too many people, they still need to queue up, and password input errors are common on the scene, which takes longer. On the other hand, the security of password recognition is poor, and others may remember the password through gestures, resulting in password disclosure. Due to these reasons, access control using password identification is less and less used, generally in storage cabinets, safes and so on. 2ã Card access control system card access control system can be divided into contact card access control system (such as magnetic stripe card, bar code card, etc.) and non-contact card access control system (such as induction card and RF card). At present, the non-contact card door ban system is widely used. It is welcomed by users because it is not easy to wear, good durability, fast reading speed and high security. On the contrary, because the contact card is easy to be worn and damaged and used less times, the scope of use is becoming smaller and smaller. We often use magnetic stripe cards such as bank cards. 3ã Biometric access control system biometric access control system is recognized based on human characteristics. The most common one is fingerprint identification system. In addition, there are palm access control system, iris (retina) access control system, portrait recognition access control system, etc. The biometric mode has high security, is not easy to copy and is convenient. The disadvantage is that the human characteristics will change, resulting in an increase in the rejection rate and a constant. At present, this identification access control system is mostly used in a few areas with high security requirements. Well, we'll introduce the types of access control systems here. Thank you for reading.