From IAB Wiki
Sponsorship represents custom content and/or experiences created for an advertiser which may or may not include ad unties (i.e., display advertising, brand logos, advertorial and pre-roll video).
Sponsorships fall into several categories:
- Spotlights are custom built pages incorporating an advertiser’s brand and housing a collection of content usually around a theme;
- Advergaming can range from an advertiser buying all the ad units around a game or a “sponsored by” link to creating a custom branded game experience;
- Content & Section Sponsorship is when an advertiser exclusively sponsors a particular section of the site or email (usually existing content) reskinned with the advertiser’s branding;
- Sweepstakes & Contests can range from branded sweepstakes on the site to a full-fledge branded contest with submissions and judging.