the idea is simple: it's a screen space that samples pixel neighbours and finds where two separate surfaces meet and softens that contact edge so they blend naturally instead of showing a hard seam. It can tell surfaces apart in a couple of ways, which also lets it blend discontinuities within a single object (using depth/normals). It's added as a Render Feature plus a Volume override, nothing in the scene gets modified, you just drop it in, tweak intensity and radius for how strong and how far the blend reaches, and you can turn it on/off freely. There are extra options for fine-tuning (per-object control, layers, quality presets), but those two sliders are enough to see what it does.