To be used during all the official presentations, "publicly", in publications, among other logos in the sponsor block, in the banner advertising, on the main page of the website as the main visual element.
Is used in such settings when "The main logo version with caption" is not applicable. For example, small carriers: flash drives, pens, badges, stickers. etc.
Used in extreme settings when it is impractical to use any of the major versions. For example: a wide-format narrow banner with proportions 18:5 and narrower.