Market Definition Cross-channel marketing hubs (CCMHs) build on nearly 50 years of marketing technology (martech) evolution: from early direct mailing lists to database marketing, and on to CRM, email marketing, and cross-channel campaign management (CCCM). Along the way, digital technology innovations — both on-the-glass and below-the-glass — have irrevocably associated CCMHs with a multitude of customer experience (CX) channels, including web, e-commerce, mobile, and social media.