Buffers can be formed as a set of rings based on what factor?

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When you create buffers that appear as concentric rings around features, the radii of those rings come from distance values. Using an attribute distance means each feature has its own distance value in the data, and you generate the rings based on those values. That lets you form multiple rings around each feature where the boundaries are defined by the attribute, for example rings at 0–50 units, 50–100 units, etc., all driven by the data in a distance field. If you used a single specified distance, you’d get uniform rings for all features, not a set of rings driven by per-feature values. Map scale mostly affects how the rings are drawn on screen, and ring density is about how many rings you choose within a distance, not the fundamental factor that determines the ring radii. So the factor that enables a set of rings to be formed is the distance stored in an attribute.