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The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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Виктория Кондратьева (Редактор отдела «Мир»)
It also became one of the early examples of user interface design conventions such as badges, rating buttons, sharing and recommendation features which have largely become standard features across media platforms today.