Digital marketing refers to the use of digital channels, such as search engines, social media, email, and websites, to promote a product or service. It includes a variety of tactics and techniques, including search engine optimization (SEO), pay-per-click advertising (PPC), content marketing, and social media marketing. Quizlet is a website and mobile application that allows users to create and share flashcards, study games, and other learning tools. Quizlet itself is not a digital marketing tool, but it can be used as a resource to help with studying and learning about digital marketing concepts and strategies.