Digital marketing involves promoting brands online through various channels like search engine optimization (SEO), social media marketing (SMM), pay-per-click (PPC) advertising, affiliate marketing, email marketing, content marketing and graphic design. SEO involves optimizing websites to rank higher in search engine results pages organically, while SMM focuses on promoting products via social media platforms like Facebook, Instagram and Twitter. PPC advertising allows targeting of specific audiences through paid search, video and display campaigns on platforms such as Google Ads.