Colour fonts use an innovative font technology that allows built-in SVG (Scalable Vector Graphics) to enhance the way the fonts appear. This new standard allows colour information to be stored inside a font and could change the way people interact with type.
You can use fonts anywhere, just like the fonts you’re used to on your computer or website — but since colour fonts are still fairly new, we’re still in the early days of realizing their potential. For instance, the image above is a screenshot from a project I worked on a couple of years back without knowing anything about this technology, but hoping colour fonts could someday be a thing. And here we are!
Read more about colour fonts here
and more about how Adobe uses this new technology and the development process for Trajan Color Concept and EmojiOne Color here.