WhatsApp is a widely used mobile messaging application that enables users to communicate via text, voice messages, images, videos, and documents over an internet connection, bypassing traditional SMS fees. Developed in 2009 by Jan Koum and Brian Acton, it was acquired by Facebook (now Meta Platforms) in 2014 for $19 billion. The app supports voice and video calls, group chats accommodating up to 1,024 members, and features end-to-end encryption to ensure user privacy. Available on iOS, Android, and desktop platforms, WhatsApp has over 2 billion active users worldwide, making it a staple for personal and business communication. It also integrates features like status updates, similar to social media stories, and WhatsApp Business for customer interactions.