Using the Paragraph Dialog Box
Line spacing often determines how easy it is to read a document. It is measured in lines, or points, and can be changed to single, double, or one-and-a-half-space increments.
When line spacing is measured in points, it is referred to as leading (pronounced ledding). Reducing leading makes the lines closer together and can make text difficult to read, while increasing leading can help its readability. For example, a 10-point font usually uses 12-point leading. This is the default.