Digital marketing is the promotion of products, services, or brands through electronic devices. It involves the use of tools like blogs, social media, search engine optimization (SEO), search engine advertising (SEM), big data, display ads, content marketing, video, mobile apps, and customer relationship management (CRM) to target potential customers. The key areas of digital marketing are SEO, display advertising, e-CRM, content marketing, and social media communication. Digital marketing allows for cheap, global reach and easy analysis of marketing efforts. It is a creative, interactive way to promote brands without physical limitations.