Digital marketing involves using electronic media like the web, email, and mobile to manage and execute marketing. The marketing communication environment is changing as technologies allow consumers to interact and communicate through online channels and social media apps. Popular social media platforms include Facebook, Twitter, Instagram, Pinterest, LinkedIn, and YouTube, which businesses use to engage customers, build awareness, and increase social sharing. The document discusses definitions of digital marketing and social media, reviews key social media platforms and trends, and presents the SOSTAC model for planning digital campaigns.