Digital marketing is the practice of promoting products or services using digital technologies, mainly on the internet, but also including mobile phones, display advertising, and any other digital medium. It encompasses a wide range of activities, including:

1. Search engine optimization (SEO): This is the practice of optimizing your website to get it to rank higher in search engine results pages for certain keywords.

2. Content marketing: This is the practice of creating and distributing valuable, relevant, and consistent content to attract and retain a clearly defined audience, and ultimately drive profitable customer action.

3. Social media marketing: This is the practice of promoting your business or brand and its products or services on social media platforms.

4. Email marketing: This is the practice of sending marketing messages to potential and current customers via email.

5. Pay-per-click (PPC) advertising: This is a form of advertising where you pay a fee every time someone clicks on one of your ads.

6. Affiliate marketing: This is the practice of promoting other people's products or services and earning a commission for each sale made as a result of your marketing efforts.

7. Influencer marketing: This is the practice of collaborating with people who have a large following on social media or on other platforms and promoting your products or services to their followers.

8. Video marketing: This is the practice of using videos to promote your business or brand and its products or services.

There are many other aspects to digital marketing, and it is constantly evolving as new technologies and platforms emerge. To learn more about digital marketing, you can take online courses, get a degree in marketing, or work with a digital marketing agency or consultant.