WhatsApp is a widely used messaging application founded in 2009 by Brian Acton and Jan Koum. Initially launched as a status update app, it quickly transitioned to focus on instant messaging, leveraging Apple’s push notifications for real-time communication. WhatsApp emphasizes a simple, user-friendly interface with a commitment to "No ads! No games! No gimmicks!" The app offers a range of communication services, including text messaging, multimedia messaging, voice and video calls, and status updates. It supports seamless cross-platform communication across iOS, Android, and other devices. WhatsApp ensures user privacy and security through end-to-end encryption for messages and calls. With over 2 billion active users globally, it serves both personal and business communication needs, particularly in regions where SMS is costly. After being acquired by Facebook in 2014, WhatsApp shifted to a free service and introduced features like stickers and business tools to enhance customer engagement for small and medium enterprises.