Popular mobile messaging apps refer to digital communication platforms designed primarily for smartphones and tablets that enable users to exchange text messages, voice notes, video calls, images, documents, and other media over the internet rather than through traditional SMS/MMS networks. These applications leverage internet connectivity (either mobile data or Wi-Fi) to facilitate real-time interactions between individuals and groups across geographical boundaries. Their popularity is typically measured through metrics such as monthly active users (MAU), download statistics, user engagement metrics, and market penetration across different regions. These platforms often incorporate features beyond basic messaging, including payment systems, business tools, content sharing, and social networking elements, turning them into comprehensive communication ecosystems. Their ubiquity has fundamentally transformed how people maintain personal relationships, conduct business communications, and share information in the digital age.