Digital marketing involves using digital channels like websites, social media, mobile apps, and email to communicate the right message to the right audience. It is a fast-changing field as people now get information online rather than traditional media like newspapers or TV. Digital strategies include search engine optimization (SEO), pay-per-click (PPC) advertising, content marketing, social media marketing, email marketing, mobile marketing, and more. Success relies on understanding audience insights like how most consumers now research online before purchases.