Digital marketing utilizes various online tools to promote products, websites, and services. It includes search engine optimization (SEO) which helps websites rank higher in search engines, pay-per-click (PPC) advertising, social media marketing, content marketing, email marketing, mobile marketing, marketing analytics, and affiliate marketing. Common digital marketing activities involve creating backlinks and on-page content to improve SEO, running paid search ads, posting on social media, producing unique content, sending email newsletters, using mobile-optimized ads, analyzing marketing performance, and having bloggers promote products.