An intervening shot of scenery or something else relatively innocuous between two scenes, or in the middle of dialogue. Fairly common in Japanese Cinema and Anime, first attributed to Yasujiro Ozu.
Generally it consists of a still of the sky, or a building, with some kind of ambient noise in the background, usually crows, the wind, or cicadas or even crowds murmuring.
If you could remove the shot, and it would have no effect on the plot, or the viewers understanding of it, it's a pillow shot.
Often an Aspect Montage
Watch pretty much any anime and you'll see a pillow shot at some point. Due to that fact, I think only having particularly egregious examples is necessary.