Digital marketing is defined as the use of digital channels to promote a product or service. It's the opposite of offline marketing, for example. The goal of this approach is to connect with customers online—the place where they spend the most time seeking information or entertainment.

Digital marketing is a broad practice, simply because there are so many online channels available. Posting on social media is a form of digital marketing, as are email marketing and blogging. Together, the promotional content on these various platforms forms a cohesive online marketing strategy. Whether you are focusing on event marketing or creating an email subscriber list, digital marketing is an incredibly important facet.

Digital marketing encompasses a wide range of strategies and techniques aimed at promoting products or services through online channels. Here are some common categories within digital marketing:

1. Search Engine Optimization (SEO): The process of optimizing your website to rank higher in search engine results pages (SERPs) to increase organic (non-paid) traffic.

2. Search Engine Marketing (SEM): Paid advertising to appear in search engine results. This includes pay-per-click (PPC) advertising like Google Ads.

3. Social Media Marketing (SMM): Utilizing social media platforms like Facebook, Instagram, Twitter, LinkedIn, etc., to promote products or services and engage with the audience.

4. Content Marketing: Creating and distributing valuable, relevant, and consistent content to attract and retain a clearly defined audience. This can include blog posts, videos, infographics, ebooks, etc.

5. Email Marketing: Sending commercial messages to a group of people via email to promote products or services, engage with customers, or build brand awareness.

6. Influencer Marketing: Partnering with influential individuals on social media platforms to promote products or services to their followers.

7. Affiliate Marketing: Partnering with other businesses or individuals (affiliates) who promote your products or services and earn a commission for each sale made through their referral.

8. Mobile Marketing: Targeting users on mobile devices through various channels like SMS, mobile apps, or mobile-optimized websites.

9. Video Marketing: Using videos to promote products or services, engage with the audience, or build brand awareness. This can include ads on platforms like YouTube, as well as video content on social media.

10. Analytics and Data-driven Marketing: Using data and analytics to measure the performance of marketing campaigns, gain insights into customer behavior, and optimize marketing strategies accordingly.

These categories often overlap and can be integrated into comprehensive digital marketing campaigns tailored to specific business goals and target audiences.