Modifiers

Even though you used smooth shading in the mesh, the object still doesn’t look just right, as it has a very low resolution. You could use a Subdivision Surface modifier to add more detail to the surface and smooth it out (at the cost of adding more polygons to the object). A modifier is an element you can add to an object to alter it, such as a deformation, the generation of geometry, or the reduction of existing geometry. Modifiers won’t affect the original mesh, which gives you a lot of flexibility, and you can turn them on and off when you want.