Variable Fonts: Varied & Flexible

One file can now do what many files had to do separately: it contains a whole type family, if not a whole super family. Whereas before, each standard (or static) font was accommodated in one file, and each file is one style of the typeface. Now everything is opened up. One compressed TrueType or WOFF2 (Web OpenFont Format 2) file has a whole family of fonts in a versatile design space, including all the styles in itself and everything in between.