SUNNYVALE, Calif. — Yahoo is beginning to pull the wraps off an online advertising system that the company said would help it and its partners drive sales of graphical and other premium ads.

Yahoo executives Hilary Schneider and Michael Walrath.

Yahoo said the system, called AMP and still months away from being ready, would greatly simplify the task of selling online ads, allowing Yahoo’s publishing partners, for instance, to place ads on their own sites as well as on Yahoo and on the sites of other publishers in the company’s growing network. Advertisers will be able to focus those ads by demographic profile, geography and online behavior, the company said.

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