Gemoo is an innovative way of communicating visually and instantly. It allows users to easily express their thoughts using videos, screen recordings, and screenshots that can be shared securely. The top five features of Gemoo include 4K videos and uncompressed HD screenshots, real-time annotations, copyable links, a password-protected link option, and the ability to convey emotions with facial expressions, voice, and actions. The top five use cases for Gemoo include sharing feedback at work, creating how-to guide videos, outlining tasks, documenting progress, and providing training materials.