To use WhatsApp Web, you must have WhatsApp installed on your mobile phone and be signed in to your account. WhatsApp Web is the web version of WhatsApp that lets users send and receive messages from their computer browsers. WhatsApp is a cross-platform messaging app that allows users to communicate with each other without incurring SMS charges. Find out what WhatsApp Web is, how it works, and how you can start using it today. WhatsApp is the most used social media platform in the world.