There are a few methods to smooth up a surface:

A. In case your object is entire curve[e.g. a ball], with the object selected in button window Editing tab[F9], Link and Material panel press Set Smooth button. If the object look odd you may have to go in edit mod pressing TabKey select all vertices and press Ctrl+NKey to recalculate normals outside.

B.In case an object have curved parts and flat parts [e.g. the chair from Project1-see download section] go in edit mode select only the mesh part that have to be smooth [pointer over the mesh and press LKey] and press WKey>Set Smooth

C.In case that the same mesh have flat and curved surfaces you have to apply a Edge Split modifier[Editing tab Modifiers panel]. First in edit mode select the edges who delimitate the flat and curve surface and press Ctrl+EKey>Mark Sharp after that apply the Edge Split modifier. Make sure From Market as Sharp button is selected and the surface is smooth.

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