Which CSS property is used to set the spacing between lines of text?

The line-height property in CSS is specifically designed to control the space between lines of text, referred to as leading in traditional typography. By adjusting the line-height, you can influence how the vertical space between lines is perceived, which can enhance readability and aesthetic appeal.

When you set the line-height, it can accept various values, such as unitless numbers, percentages, or length values (like pixels or ems). This flexibility allows for precise control over the text's appearance in different contexts. For instance, a line-height of 1.5 will make the space between lines 1.5 times the font size, leading to a more open and easier-to-read presentation, especially in longer texts.

The other options do not apply directly to line spacing. Margin defines space outside an element while padding defines space inside an element around its content. Text-spacing is not a standard CSS property; hence, it's not available for controlling the line spacing.