This specifies the values for each of the font's variation axes. In this form, the value for each axis ranges from its specified minimum to maximum, which are defined in the Axes window . This is another way to specify the values for each variation axis. An instance is a font style which is defined by the Variation data in the font. For every variation axis in the font, an instance is assigned a value between the Min and Max setting for that variation.
Instances are also assigned names.
This instance uses the standard font weight and the standard font width. This instance uses a lighter weight than standard and a wider width i.e. glyphs have narrower lines but are wider overall.