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The best way to describe anti-aliasing is to show an example. Without AA you will have jagged lines. They will look like stair steps. AA uses different shaded edges. The edges have lower opacity pixels on the outside and middle opacity as you move towards the center. This creates the illusion of smooth lines. Try creating lines and arcs without/with AA and zoom in.
Anti-aliasing will effect lines and arcs. It will also effect fonts. Paint Shop Pro gives you the option of smooth/sharp/off AA for fonts. Anti-aliasing also applies to creating selections. If you are trying to remove a background from a logo this will effect the edges. You may notice this especially after re-sizing the logo. Here's a tip: if you have a logo that has the "jaggies" try adding some minimal (very minimal) blur to the layer. Try different types of blur. This may smooth out the edges. It will look like anti-aliasing has been applied.
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