Hyperloop is a proposed high-speed transportation system consisting of pods traveling inside steel tubes using magnetic levitation. It was envisioned by Elon Musk as a faster, safer, cheaper alternative to existing modes of transport like planes, trains, cars, and boats. The pods would travel in low-pressure tubes on air bearings powered by solar energy. This would allow passenger and cargo pods to move at speeds up to 700 mph, making it faster than existing options while using less energy. Advantages include very high speeds, low costs, immunity to weather, and ability to go anywhere via tunnels or across barriers. However, high speeds may cause passenger discomfort and initial costs are very high.