Antialiasing fuzzes out edges of graphical elements so as to avoid the appearance of jaggedness associated with discrete screen pixels.
With the default setting Antialiasing->Automatic, choices are made to optimize appearance on each type of computer system.
With Antialiasing->True, black lines may appear slightly gray.
Antialiasing can be turned on and off not just for complete graphics, but also for individual primitives or groups of primitives within a single graphic.
Antialiasing does not alter the appearance of fonts. Font antialiasing is typically controlled by a global operating system setting.
EXAMPLES
Basic Examples 
Scope 