WhatsApp is a free messaging app that allows you to send messages, photos, videos and files to your contacts. It supports text, voice, and video calling, and can also be used to share location information. It also facilitates group chats with up to 256 people. You are able to create group chats for students, colleagues, families and friends to chat, share files, images and videos. It can be used for multiple purposes, such as for business communications, for keeping in touch with friends and family, for sharing news, for events and invitations, and more.