Which property is used to control the spacing between text characters in CSS?

The property used to control the spacing between text characters in CSS is letter-spacing. This property specifically adjusts the amount of space between individual characters in a text string, allowing for greater control over the typography and legibility of the content.

While line-height affects the vertical spacing between lines of text, and margin and padding are used for spacing outside and within elements respectively, they do not specifically address the spacing between characters. Letter-spacing enhances text readability and can also be used creatively to achieve a desired visual effect in web design.