Font sizes refer to the measurement of text in a document, typically expressed in points (pt). One point is equal to 1/72 of an inch, meaning that a 12-point font is approximately 1/6 of an inch tall. Different font sizes can affect readability and the overall appearance of printed or digital content. In design and typography, choosing the right font size is crucial for conveying information effectively. Larger font sizes are often used for headings and titles, while smaller sizes are suitable for body text. Adjusting font sizes can help create a visual hierarchy, guiding readers through the content more easily.