DSPs are advertiser/agency facing systems that let buyers do self-service media buying from publishers, aggregators, and exchanges

I think the self service part might be a little misleading but this description and link provide a more than basic intro of Demand Side Platforms:

DSPs are advertiser/agency facing systems that let buyers do self-service media buying from publishers, aggregators, and exchanges

via DSPs: What they really are and why you should care – iMediaConnection.com.

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