What is the difference between a serif and sans serif font?

The distinction between serif and sans serif fonts primarily revolves around the presence or absence of small projecting features on the ends of their strokes. Serif fonts feature these decorative lines, known as "serifs," which can enhance readability, particularly in printed materials. This embellishment can lead to a more formal or traditional appearance, often seen in print publications like books and newspapers.

In contrast, sans serif fonts lack these features, creating a cleaner, more modern look. The absence of serifs makes sans serif fonts especially popular for digital displays, as they often render well on screens and provide a streamlined reading experience.

The other options present inaccuracies regarding the characteristics and applications of serif and sans serif fonts, which contribute to their distinction in typography. Thus, the primary feature that differentiates the two is indeed the presence of these small lines at the ends of strokes in serif fonts, making option B the accurate choice.