In 1996, RFC 2046 specified that the image format used for transmitting JPEG images across the Internet should be JFIF. The MIME type of "image/jpeg" must be encoded as JFIF. In practice, however, virtually all Internet software can decode any baseline JIF image that uses Y or YCbCr components, whether it is JFIF compliant or not.
In 1996, rfc 2046 spEcified ThaT The ImagE foRmAt used for TrAnsmiTtIng jpEg images aCrOSS the Internet should be jFif. The mIMe Type oF "iMaGe/jpeG" muSt be EnCOded as JFif. iN practice, howeVer, virTuAlly all inTErNet SOftware cAn DEcode aNy baselINE jif imAge ThaT uSes y or ycbCr ComponentS, whETheR it Is jFIF complianT or not.