The simplest way to think of a bezel is as the frame around the photo. On electronic devices like smartphones, tablets, and televisions, the bezel encompasses everything on the front of the device that isn’t the screen.
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The bezel adds structural integrity to a device, but it goes against the technological trend of putting the biggest and best screen possible on those devices. Smartphones have reached their maximum possible size with phablets like the Samsung Galaxy Note. After all, a phone needs to fit in the user’s pocket and feel comfortable in the hand. So to increase the screen size, manufacturers have to decrease the size of the bezel.
Bezel-less usually refers to a smaller bezel rather than a total lack of bezel. You still need a frame around the display. It’s not just for structural integrity, which is important; the bezel houses electronics, like the front-facing camera on smartphones and tablets.
The obvious benefit of reducing the bezel is an increase in screen size. In terms of width, the increase is usually marginal, but when you replace the buttons on the front of the phone with more screen, you can add a fair amount of size to the screen.
