olemus
müük vahendajateta otse tarbijaile,
näiteks postitellimuste või telefonimüügi kujul

Oxford Languages:
the business of selling products or services directly to the public, e.g. by mail order or telephone selling, rather than through retailers

ülevaateid
https://en.wikipedia.org/wiki/Direct_marketing

https://www.shopify.com/encyclopedia/direct-marketing

https://ico.org.uk/media/1555/direct-marketing-guidance.pdf