Google Cardboard is a virtual reality platform developed by Google using cardboard and a smartphone. It allows users to view VR experiences inexpensively. Google Expeditions allows entire classrooms to take virtual field trips guided by a teacher's tablet. Students each receive cardboard headsets and phones to view VR content together, virtually exploring places like the ocean floor or Great Wall of China without leaving the classroom. The goal is to make VR accessible and enhance learning, though few developers currently exist.