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WOFF2
Abbreviation for Web Open Font Format 2.0
In short and in plain language
WOFF2 is the newer version of WOFF, a file type for fonts on the web.
It packs the font even more tightly. So the file is usually smaller.
Common browsers can load this format.
Definition
WOFF2 is the second version of the WOFF font format for websites. It compresses with the Brotli method and therefore usually produces smaller files than the first version. Common browsers can load WOFF2.