Digital marketing is the process of building and maintaining customer relationships through online activities. It has become necessary for many organizations as more people use the internet. Digital marketing consists of search engine marketing, search engine optimization, pay per click advertising, social media marketing, and content marketing. Search engine optimization involves getting high rankings in organic search results to drive free traffic to a website. Pay per click allows advertisers to pay only when users click on ads. Social media provides targeted traffic and a way to build relationships with customers. Measurement tools help calculate return on investment and measure effectiveness.