What is .woff file?
The ".woff" file extension is related with the Web Open Font Format. Open Font Format was intended to deliver lightweight, easy-to-implement compression of font data, appropriate for use with CSS. Any suitably licensed TrueType, OpenType, and Open Font format file can be packaged in WOFF format for Web use. The WOFF file format also permits supplementary metadata to be attached to the file. This is suitable for font designers or vendors contain licensing or other info, beyond that present in the original font.
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