What is an Ad Server?
The way I understand it, it should be a piece of software you put on your server and it serves ads when asked by a publisher's site. So I go out to all the publishers, give them a piece of code and they serve my ads on their site.
Now, I looked into few Ad Servers and they all look more like ad networks than like pieces of software.
Second question would be, are there any good free self-hosted ad servers with nice user interface. Something like Prosper202 is for tracking.
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