WA is a free and instant messaging app with chat that allows you to make calls, send images, videos, audio, and more. It is developed by the company called WhatsApp Inc., which was founded in 2009 in Switzerland. The app is available for iOS, Android, Windows Phone, macOS, and other operating systems. It is one of the most popular apps in the world, with over 1.2 billion downloads in the first year.

You can also send voice and video calls using WhatsApp Messenger for iOS, Android, and Windows Phone. It is available in 47 languages, including Arabic, Bangla, Bulgarian, Catalan, Chinese, Croatian, Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian, Polish, Portuguese, Romanian, Russian, Slovak, Spanish, Swedish, Turkish, Ukrainian, and Vietnamese.

It allows users to send and receive messages, audio, and video calls, and it is available on most mobile devices. It is free to download and use.