Proportionally spaced type uses different widths for different characters. Most of this handbook is in proportionally spaced type. A monospaced face, by contrast, uses the same width for each character. ... This sentence is in a proportionally spaced font; as you can see, the m and i have different widths.

What monospace means?

A monospaced font, also called a fixed-pitch, fixed-width, or non-proportional font, is a font whose letters and characters each occupy the same amount of horizontal space. This contrasts with variable-width fonts, where the letters and spacings have different widths.

What font is monospaced?

The only monospaced TrueType fonts shipped by Microsoft are Courier New, which shipped with Windows 3.1, and Lucida Sans Typewriter, which was included in the TrueType Font Pack.