Samantha Lee/Business Insider
- WhatsApp is a free, multiplatform messaging app that lets you make video and voice calls, send text messages, and more — all with just a Wi-Fi connection.
- With over 2 billion active users, WhatsApp is especially popular among friends and family who live in different countries and want to stay in touch.
- WhatsApp's global popularity is due in large part to its accessibility, cross-platform functionality, and simple, straightforward features.
WhatsApp might be a little-known messaging app in the US, but in many parts of the globe, it's an essential part of everyday life. The Facebook-owned app is easily one of the most popular messaging services in the world.