When YouTube launched 12 years ago, it was a single website that supported one video format, 320x240 at 4:3 aspect ratio. Fast forward to today, and YouTube lets you watch any combination of SD, HD, 4K, 360, 3-D, and live video on nearly every device with an internet connection – from desktops to phones, tablets to TVs, game consoles, and even VR headsets. We’ve also introduced apps and services t