WhatsApp is a widely used messaging application that allows users to send text messages, voice messages, images, videos, and make voice and video calls over the internet. It employs end-to-end encryption, which means that only the sender and recipient can read the messages, ensuring privacy and security. WhatsApp is available on smartphones and computers, making communication seamless across devices. Its encryption technology helps protect user conversations from hackers and unauthorized access, making it a popular choice for secure personal and group communication worldwide.