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I cant think of projections that how it works own my own I don't know why projection needed in snapping I want to know how projection works in snapping.

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When Project onto Self is disabled, you can only snap to geometry of other objects.
It's useful when you go to Edit mode with multiple objects at once.

Notice I can only snap to the other object's vertices unless I enable Project onto Self. enter image description here

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...Why 'Projection'? Because sometimes that's what it is.. (actually, internally, it always is). Here, the move is ShiftZ constrained to XY, so the snap is in X and Y only, projected down Z.

enter image description here

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