One name, two industries, both of them wealthy. In digital advertising, ad network is standing vocabulary and the sector forms new intermediaries constantly: representation firms, publisher collectives, vertical networks, and marketplaces connecting advertisers with niche inventory. An address stating the business model in one glance is worth having in a field where explaining what you do takes a meeting. In networking hardware and software, ADC means application delivery controller, a real enterprise category sold through long cycles to technical buyers.