Weight (represented by the wght tag) defines the design axis of how thin or thick (light or heavy, in typical typographic terms) the strokes of the letterforms can be. For a long time in CSS there has existed the ability to specify this via the font-weight property, which takes numeric values ranging from 100 to 900 in increments of 100, and keywords like normal or bold, which are aliases for their corresponding numeric values (400 and 700 in this case). These are still applied when dealing with non-variable or variable fonts, but with variable ones, any number from 1 to 1000 is now valid.
It should be noted that at this point there is no way in the @font-face declaration to 'map' a specific point on the variation axis of a variable font to the keyword bold (or any other keyword). This can generally be resolved fairly easily, but does require an extra step in writing your CSS:
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