> Global shutter is a method of ending an exposure where all the image data is captured simultaneously. This is distinct from most existing shutter systems (electronic and mechanical) that start and end progressively: working their way across the sensor.

Buried at the bottom of the article. This is interesting for especially video and sports photography. Some cameras with slower sensors suffer from the rolling shutter effect where fast moving subjects get distorted because the subject or the camera is moving. Think e.g. lampposts looking diagonal when shot from a fast moving car. Capturing all the pixels in one go solves that.

Cropping the sensor is a common way to counter rolling shutter with current cameras. Basically, that means you are not using all of the pixels on the sensor and capture a smaller area. Aside from the quality, this also means that you don't use everything the lens captured; it's cropped away. So, it looks like you are using a larger focal length than you actually are and you can't capture at the full width of the lens.

Lots of cameras use cropping to support higher resolutions and frame rates because they can't read out the sensor fast enough. This new sensor can use the full resolution and doesn't have to crop.

And like with photography, you use shutter speed and aperture to control what the video looks like. 1/30th of a second is actually a relatively long exposure for a photo. And that's also potentially a lot of rolling shutter to deal with. An instant and fast readout means you have more wiggle room to play with this creatively or shoot in very bright or low light.