The variable font is a single font, yet it can exhibit multiple appearance. It can be considered as evolution of Open type fonts. The permutation of appearance is stored in a single font and the file size may be larger than the traditional font. It gives css authors to vary the size and appearance based on content and context while working with single font. font-variation-settings provides low level control to modify the weight (thickness), font stretch and other related properties which are manipulated by axis of variation (identifiable by axis tag).