Both Jan Koum and Brian Acton are the founders of WhatsApp. He invented WhatsApp.

Jan Koum is a Ukrainian immigrant. Both of them worked in Yahoo company.

Brian Acton quit WhatsApp in 2017.

After leaving WhatsApp, Brian Acton invested in many companies. Signal was also a company in it.

All the funding required for WhatsApp was done by Brian Acton.

Jan Koum had the idea of ​​how the design of WhatsApp would be.

Facebook acquired WhatsApp in 2014.

Facebook has bought WhatsApp for $19 billion.

WhatsApp is used all over the world.

Applications like wechat were competitors of whatsapp.

The popularity of WhatsApp is increasing day by day.