Digital marketing refers to the practice of promoting products or services using digital technologies, such as the internet, social media, mobile apps, and other digital channels. It includes a range of activities and strategies, including search engine optimization (SEO), content marketing, email marketing, social media marketing, pay-per-click (PPC) advertising, affiliate marketing, and more. Digital marketing professionals use these and other tactics to reach and engage with customers online, and to measure and analyze the results of their efforts.