What is a font?
A font is letters, numbers, punctuation marks in the same variant. And that involves a font. A font indicates what the typeface is: which style? how big?
A description of the letters
A font is the description of the design of the typeface. A font specifies the lettertype, the style such as regular, italic, underlined or bold and the font size. Even when a text has the same lettertype, a change in style or size creates a different font.