Yet another Windows 10 information hub, the action center shows you your latest notifications. Emails, updates and app messages all appear in a drawer that pulls out from the right hand side of the screen.
It also gives you access to quick settings, including airplane mode, Bluetooth, Wi-Fi, screen brightness and other options. You can also access "all settings" from the notification center (which doesn't actually give you access to all settings -- see slide 10).
It's a nice way to get a quick glimpse at important messages and quickly turn on or off connectivity.