Cortana is a special feature in Windows 10 system. The specific opening method is as follows:
1. Click the circle icon or search box on the right of the start menu in the lower-left corner of the desktop.
There is no search box or icon. You can right-click in the taskbar to set the search box.
2. Select "yes" to open Cortana.
To use Cortana, you need to bind the Microsoft account to the computer. If there is no binding, the binding interface of the Microsoft account will pop up, and you can bind here.
3. Click the microphone icon in the lower right corner of the search box, input voice into the MIC of the computer, and you will get Cortana's voice reply later.