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.

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Brian Acton quit WhatsApp in 2017.

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

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

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

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Facebook acquired WhatsApp in 2014.

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Facebook has bought WhatsApp for $19 billion.

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WhatsApp is used all over the world.

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Applications like wechat were competitors of whatsapp.

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The popularity of WhatsApp is increasing day by day.

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