In typography, what does tracking refer to?

Tracking refers to the consistent spacing between characters in a block of text. It adjusts the overall density of the text, which can affect both readability and the visual appeal of the typography. When tracking is increased, the space between each character widens, which can create a lighter, airier feel, whereas decreasing tracking brings characters closer together, potentially creating a more compact and dense appearance. Understanding how to manipulate tracking is essential for typographers and designers, as it plays a crucial role in how text is perceived and can enhance or detract from the message being communicated.

The other options pertain to different aspects of typography: spacing between lines refers to leading, measurement of font size deals with point size rather than character spacing, and alignment pertains to the placement of the text within a layout, such as left, center, or right alignment.