WhatsApp's success metrics can be measured in a variety of ways. Some important metrics include: - Active users: The number of people who use WhatsApp on a regular basis. - Retention rate: The percentage of users who continue to use WhatsApp over time. - Engagement: How frequently users interact with the app, such as by sending messages, making calls, or joining groups. - Revenue: How much money WhatsApp generates from its various monetization strategies, such as charging businesses to use the app or offering paid features to users. - Market share: How much of the messaging app market WhatsApp controls compared to its competitors. Overall, WhatsApp's success is dependent on its ability to maintain a large and engaged user base while also generating revenue through various strategies. The company's success has been impressive, with over 2 billion active users and a significant portion of the messaging app market share. However, as the messaging app space continues to evolve, WhatsApp will need to continue to adapt and innovate in order to maintain its position as a leader in the industry.