Good initiative that Whatsapp developed a web interface to use the various features of the application in the form of a website. It helps a user to stay connected in Whatsapp who spends less time on his phone but works on his computer most of the time.
The GUI is similar to that of the application and very simple to use. The contents present in his phone is sync to the computer and the changes in the chats made in the computer are also sync to the phone.
The connection between the computer and the phone is made by scanning a QR code by the application in the phone, which is generated by the computer. It takes a little time to securely establish the connection.
The only disadvantage is that both computer and phone should be connected to internet and application should remain opened in the phone.
Thank you.