WARC This link opens in a new windowWarc.com is an online service offering advertising best practice, evidence and insights from the world's leading brands. Warc helps clients grow their businesses by using proven approaches to maximize advertising effectiveness. In addition to its own content, Warc features advertising case studies and best practices from more than 50 respected industry sources, including: The Advertising Research Foundation, Cannes Lions, Effie Worldwide, Association of National Advertisers, ESOMAR, 4A's, The IPA and DMA.