Use Bridge Curve in a 2-D sketch to create a smooth (G2) spline that connects two selected sketch curves. Bridge Curve is typically used to create contiguous geometry. The following image shows a Bridge Curve closing a gap to create contiguous geometry for patching a surface.
Bridge Curve can also generate a curve with smooth (G2) continuity to close an open loop. Use the connected curves to define a patching surface or a runoff surface.