How to design Whatsapp-like database

How to design WhatsApp-like database is the most popular question. Building a chat app might not seem like a good idea. After all, chat has long survived itself. However, no one thinks about how the same WhatsApp appeared. It is also a kind of chat where people can easily communicate and share files.
Mobile messengers have completely overshadowed SMS and MMS, which were not so long ago popular all over the world. Full digitalization is a great opportunity to make money online. All you have to do is create an application that brings people together to communicate.
Whatever your mood, it is better to consult with a specialist to get an incredible result.