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Explanation: Werbekunden are the customers (i.e. usually companies) who employ a media agency for the purposes of running an advertising campaign.
So they are customers buying advertisements.
As you will know, in German you can create all kinds of compounds and this is what is meant by this particular compound.
And I suppose the "Schnittstelle zwischen Werbekunden und Medien" will be the media agency, which runs the media campaign required by the Werbekunden. Hope that helps, even if it is in English.
Ruth Ahrens United Kingdom Local time: 08:58 Specializes in field Native speaker of: German