A digital certificate is equivalent to a certification program. It will make your Alipay account safer. If you apply for a digital certificate on a fixed computer, then if you use Alipay on this computer, the money in your Alipay (Taobao's online account) can be imported into the digital certificate and can be used normally. The digital certificate Its usefulness is only equivalent to a "digital key". If you go to an Internet cafe to use another computer to buy something or use the money in your Alipay, it should be because there is no digital certificate, and the money in Alipay cannot be used. This will prevent others from knowing your password and stealing your online account. If you want to use your Alipay on another computer, you only need to copy the digital certificate to your USB flash drive, and then import it when using it on any computer. It can be used normally, which is equivalent to the key to the door. Haha