WhatsApp is a popular cross-platform text messaging app that lets you text and talk using only your data plan. The most famous messenger in the world. WhatsApp is arguably the best chat application. The main components of WhatsApp include video calls and voice calls. This means you will be able to contact the people in your contact list who are using this app at no cost. The best thing about what makes it big is its huge global user base. This eliminates the need for SMS packages. Secure encrypted messages allow you to have a secure chat or group chat. Professional and group messaging tools let you interact with multiple people with ease.