How can you treat the junction between two separate surfaces?

What will be an ideal response?

You can insert a constant or variable chamfer, fillet, or blended surface between them. These three kinds of surfaces, together with the source surfaces, are typical examples of five kinds of continuity: G0, G1, G2, G3, and G4. Another way of treating two separate surfaces is to modify one of them to match the other. To modify a surface without altering the tangency direction at its edges, you adjust its end bulge. Two or more contiguous surfaces connected at their edges can be joined to become a polysurface. If the connected edges are untrimmed, you can merge them to become a single surface. The reverse of joining surfaces to a polysurface is to explode it to become individual surfaces. Merged surfaces cannot be exploded.