In my exploration of marketing strategies, I've discovered that content marketing is indeed a subset of digital marketing. It's a strategy that involves creating and distributing quality, relevant content to attract a targeted audience online. It's a key component of digital marketing as it directly connects with other digital tactics like social media, SEO, and email marketing. So, yes, content marketing not only falls under the umbrella of digital marketing, it's also one of its most effective tools. In essence, content marketing is the heart of a successful digital marketing campaign.