In typography, a font refers to a set of characters, symbols, and glyphs that share a common design and style. A font is typically defined by its typeface, which includes the design of the characters, such as the shape, weight, size and spacing of the letters and symbols. Fonts can vary in style, from serif fonts that have small decorative lines at the ends of the letters, to sans-serif fonts that have a simpler and more modern look. Fonts are used in various applications, such as print design, web design and user interfaces. Choosing the right font is an important aspect of design, as it can affect the legibility, readability, aesthetic and feel of the text.