How are digital fonts different from the cast-metal fonts used by early printers?

Early printers relied on physical, cast-metal fonts, whereas modern typography utilizes digital files. The primary differences between these two methods include:

• Physicality vs. Digitization: Early fonts were composed of individual characters cast from type metal—an alloy of lead, antimony, and tin—which served as physical templates for printing. In contrast, modern fonts are stored as digitized images or data files.12
• Flexibility and Scaling: Because cast-metal fonts were physical objects, they were fixed in size and style. Digital fonts are highly versatile, allowing them to be easily scaled, modified, and manipulated for use on electronic printers or digital phototypesetters.1
• Production and Storage: Early printers had to manage large, physical assortments of metal type, which required significant storage and manual assembly. Digital fonts eliminate the need for physical inventory, as they exist as software that can be reproduced and applied instantly.31

While the medium has shifted from metal to code, both systems serve the same fundamental purpose: providing a coherent set of alphanumeric characters for printing and typography.1