Improvements over WhatsApp Web:
Being a desktop App it will run on your desktop like any other installed program, and so you’ll have support for native desktop notifications, better keyboard shortcuts, and much more.
To download the application, visit https://www.whatsapp.com/download from your desktop browser. Then, open the app and scan the QR code using the WhatsApp app on your phone (look for WhatsApp Web menu under Settings). It’s all is similar to WhatsApp Web.
Note: As was required by WhatsApp Web, your phone needs to be connected to internet for the Application to work properly. The company recommends to use internet over Wi-Fi to avoid burning through a lot of data.
Just like WhatsApp Web, the new desktop app lets you message with friends and family while your phone stays in your pocket.