Digital marketing encompasses a variety of different tactics and techniques used to promote products, services, or brands through digital channels. Some common fields within digital marketing include:

1. Search Engine Optimization (SEO): The practice of optimizing websites and their content to improve their visibility and ranking in search engine results pages.

2. Pay-per-click (PPC) advertising: A form of online advertising where advertisers pay a fee each time one of their ads is clicked.

3. Social media marketing: The practice of promoting products or services on social media platforms, such as Facebook, Instagram, and Twitter.

4. Email marketing: The practice of sending emails to promote products or services or to maintain a relationship with customers.

5. Content marketing: The creation and distribution of valuable, relevant, and consistent content to attract and engage a clearly defined audience with the goal of driving profitable customer action.

6. Influencer marketing: A form of marketing in which focus is placed on influential people rather than the target market as a whole.

7. Affiliate marketing: marketing strategy in which a business rewards one or more affiliates for each visitor or customer brought about by the affiliate's own marketing efforts.

8. video marketing: use video content to promote product, brand or service.

There are many other fields within digital marketing as well, and the specific tactics and strategies used will depend on the business or organization and the goals they hope to achieve.