Digital marketing involves promoting brands and ideas online through websites, social media, email, and mobile apps. It allows marketers to interact with consumers and target ads to people with similar interests, making it a popular and cost-effective option compared to traditional marketing. Digital marketing branches into categories like social media marketing, content marketing, affiliate marketing, search engine optimization, and email marketing. Traditional marketing refers to offline methods like print, television, radio, direct mail and telemarketing that are still used alongside digital strategies.