Bulk metallic glasses are a new emerging field of materials with many desirable and unique properties, such as high strength, good hardness, good wear resistance, and high corrosion resistance that can be produced in near net shape components. These amorphous materials have many diverse applications from structural applications to biomedical implants.A complete overview of bulk metallic glasses is presented: the principles of alloy design, glass formation, processing, atomistic modeling, computer simulations, mechanical properties and microstructures.