Visit：1189 Date：2021-01-12

Let me explain separately that smart terminals are similar to ATM machines and automatic ticket vending machines.
The central processing unit is a place where all terminal data is collected for centralized processing.
The server is to support and link the computing host of these terminals and processors.
You think of the application as a web page, the front desk is the website that customers log in to see, and the backend is you log in to edit the web page, manage the website, and so on!