How To Enable Cortana :
Personal assistant Cortana in Windows 10 with one of the new features in this Windows. To take full advantage of the capabilities of Cortana, the voice activation feature is turned on so that the tasks and commands without touching it was physical.
This feature is similar to “OK Google” Android and “Hey Siri” on iOS. In Windows 10, you can say the words, “Hey Cortana” through the microphone, Cortana tasks for the next call. Subsequent requests by voice commands and also can express.
For this purpose:
Click on the search criteria in the Taskbar.
Then click on the icon Notebook.
Now click on the Settings icon.
Next, the option “Let Cortana respond to” Hey Cortana on On Set.