Tracking

Tracking, also called letter spacing, adjusts the space between all the letters in a piece of text at once. The video shows how tracking changes every gap in a word.

Small text and all-capital labels often benefit from a little extra tracking, which helps the letters stay distinct. Large headlines often look better with slightly tighter tracking.

Body text rarely needs it, because typefaces are already spaced for reading. In CSS, tracking is set with letter-spacing, often in em units so it scales with the font size.