Sans serif is a style of typeface that does not have the small projecting features called "serifs" at the ends of strokes. In other words, sans serif fonts are characterized by their clean and modern appearance, with a more minimalistic design compared to serif fonts, which have decorative ends on their letters.
The term "sans" comes from French, meaning "without," so "sans serif" translates to "without serif." Common examples of sans serif fonts include Arial, Helvetica, and Calibri. These typefaces are often favored for digital content, signage, and modern design because they tend to be more readable on screens and convey a straightforward, contemporary look.