Use sans serif fonts (Helvetica, Arial) because the near-uniform width of the strokes keeps the font readable when on the web or reduced in font size. Sans serif fonts are more legible from farther away, which is why they are good for posters and slides, particularly the titles and headers.

Serif fronts (Baskerville, Adobe Garamond) are better for reading large blocks of text where the serifs help to keep your eye focused on a line of text, helping you to recognize the word as a shape, which enhances your ability to identify the word and read quickly.

What are the three flavors of serif typefaces?
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