Cortana the new Personal Assistant integrated in to Windows. She can search the web, find things on your computer, set meetings and reminders, etc. Cortana has a new facelift and some new features in Windows 10 Insider Preview build 10074.
Integrated in the taskbar and stat button
Access to a wide range of options and the Cortana settings menu by clicking the hamburger button
Settings in Cortana where you can change certain options such as your name
A new feature in this build is when you state “Hey Cortana” cortana starts automatically. This feature is disabled by default and to enable, within the start screen switch the following on
Once you enable the above option you will have to click on learn my voice button. This will take you through 6 sentences you have to read so that Cortana can recognize your voice.