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The pentatonic scale across the fretboard is often split into parts for learning. Like this you can focus on 1 box at a time. In this lesson the fretboard animations are divided in these more bite-sized chunks to help you memorize the hole thing a little more easy.
The context of this lesson is the C Major Pentatonic scale.
In the video the first 'box' is explained and a good example is given to play it. Once you've come comfortable with this shape you can click to the next animation on the fretboard (the arrow on the upper right corner) to start practicing the next box/shape in this scale.