Mobizen for PC is a remote management service for desktop. You can use Mobizen to manage your desktop using your android device. There are more advanced features in the Windows app than the web version of Mobizen.
Mobizen is a useful app since despite the insistence of Android manufacturers, Windows and smartphone don't cooperate well. The most functionality you can get is accessing your files via USB.
Mobizen, on the other hands, allows you to access and use your android as if it were on your PC screen. And it's completely wireless. Mobizen is ideal for those who want an easier way to access their phone using Windows.