A monospace font, such as Courier, is one in which every character takes up the same amount of horizontal space.
Thus a thin “i” in a monospace font would have the same width, or pitch, as a fat “w.” A font in which an “i” is relatively thinner than a “w” would be a proportional pitch font, such as Times. Pitch is usually expressed as the number of characters printed per inch. Common pitch values are 10 and 12. Because monospace fonts have constant widths, they are often used to align tabular data into columns.