WhatsApp is a popular, free messaging and communication app available on smartphones and desktops. It allows users to send text messages, voice messages, make voice and video calls, and share images, videos, documents, and locations with individuals or groups. Using an internet connection, WhatsApp provides a secure and reliable way to stay connected with friends, family, and colleagues worldwide. It features end-to-end encryption for privacy and supports features like status updates, group chats, and media sharing. With a simple interface and no ads, WhatsApp is widely used for both personal and professional communication across over 180 countries.