Standard snaps let you snap to mesh and shape objects, as well as to the active grid.

Non-grid snap types, when active, take priority over Grid Points and Grid Lines snaps: if the mouse is equally near a grid point and some other snap type, it will choose the other snap type.
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Grid Points
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Snaps to grid intersections. This snap type is on by default.
- Grid Lines
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Snaps to any point on a grid line.
Pivot
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Snaps to pivot points of objects.
- Bounding Box
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Snaps to one of the eight corners of an object's bounding box.
- Perpendicular
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Snaps to the perpendicular point on a spline, relative to the previous point.
- Tangent
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Snaps to a tangent point on a spline, relative to the previous point.
Vertex
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Snaps to vertices of mesh objects or objects that can be converted to editable meshes. Snaps to segments on splines.
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Endpoint
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Snaps to the end points of edges on meshes or spline vertices.
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Edge/Segment
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Snaps anywhere along edges (visible or invisible) or spline segments.
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Midpoint
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Snaps to the middle of edges on meshes and spline segments.
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Face
- Snaps anywhere on the surface of a face. Back faces are culled, so they have no effect.
- Center Face
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Snaps to the center of triangular faces.