An anti-aliased output will produce an image with less jagged edges and pixilated areas. A smoothing feature.
Note: If you select the Anti-Aliased option, you will only see the effect if your video card supports this function.
No anti-alias:
With anti-alias:
To turn on the anti-aliasing feature:
1.
Click the Preferences 
button to
display the preferences dialog box.
2.Check the Anti-Aliased check box in the Render
field.
3.Click the OK 
button when
finished.