Metafont

Metafont is a programming language used to create fonts. A font is a style of writing used on a computer or other device. To create a new font, you type a set of instructions into Metafont and the program will create a new font based on the instructions. The instructions tell the program what the font should look like, including things like the size and shape of the letters, the spacing between them, and more. Metafont is a powerful tool that allows you to create custom fonts that you can use in your work.