WiZiQ is an online teaching platform that allows users to give live classes, upload and manage course content, and create tests. It has features like an easy-to-use interface without downloads, advanced whiteboarding tools, integrated recording of classes, and the ability to integrate with other learning management systems or websites. The document provides instructions on creating a WiZiQ account and uploading files to share with other users, as well as scheduling and launching a private class session and inviting others to it.