The Arial typeface comprises a lot of kinds: Common, Italic, Medium, Medium Italic, Bold, Bold Italic, Black, Black Italic, Added Daring, Excess Bold Italic, Light-weight, Mild Italic, Slender, Narrow Italic, Slim Daring, Slim Daring Italic, Condensed, Light-weight Condensed, Bold Condensed, and additional Bold Condensed.
It was designed to be metrically similar on the preferred typeface Helvetica, with all character widths similar, in order that a doc made in Helvetica may be displayed and printed the right way without getting to pay for your Helvetica license. The typeface was intended in 1982 by Robin Nicholas and Patricia Saunders, for Monotype Typography.