Digital marketing is an umbrella term referring to marketing products or services using digital technologies like the internet and mobile phones. It involves strategies like search engine optimization (SEO) to optimize websites for organic search traffic, viral marketing to leverage audiences to spread messages rapidly, and social media, search engine, influencer, email, content, and affiliate marketing. The document outlines the 4E framework for digital marketing of exciting customers, educating them, helping them experience products, and engaging them in digital activities. It then defines and provides examples of various digital marketing types.