By Solomon Tshielo

The Power of Topic Clusters, and Semantic Search

Understanding content is as easy as topics and clusters, this is a bold statement but one I intend to prove because it is. ‘Content is king’ is a well-known phrase in SEO (search engine optimisation) and this simply stems from the method and ideology behind topics, clusters or should I say ‘keyword buckets’.

Let’s start by defining topics and clusters, according to SEMRush (2024), ”A topic cluster (or content cluster) is a group of interconnected, thematically related pages on a website. Each cluster includes one pillar page, which is the main page that provides a broad overview of a particular topic. And multiple subpages (also called cluster pages), which cover associated subtopics.”.

In layman’s terms, keywords or pages are divided into groups called topic clusters. In SEO, keywords and content are the foundation of a good SEO campaign, which is potent when topic cluster driven.

How to use Topic Clusters for SEO Content?

In a practical world, topics are basically pillars and clusters are the offspring’s of pillars and provide support by expanding on the initial subject/keyword or page.

Topics can be defined as a broad subject or page that describes the brands’ target market i.e Shoes. Topics cover a wide net of the subject and usually is used as the pillar page in SEO.

According to Algorithm (2019) “The pillar page is a substantial piece of content that covers a topic broad enough that is can be broken down into smaller subtopics, which are then covered in sub-posts that link back to the pillar page.” Clusters are subgroups of the topic that break down or provide a much granular approach to keyword targeting of a page. I.e Sneakers, Boots, and Heels are all related to Shoes which is the topic.

Example for a Shoe Store or Blogger

Let’s say you have a website about shoes and where to get the best shoes in South Africa. A topic cluster could look like this:

Pillar Page: “Shoes Online” – this could a main e-commerce category page (PLP)

Cluster Pages:

• “Sneakers for Sale”   (Cluster: Sneakers)
• “Heels for Sale” (Cluster: Heels)
• “Boots for Sale”  (Cluster: Boots)
• “Loafers for Sale” (Cluster: Loafers)

Or another expansion can be :

Pillar Page: “The Ultimate Guide to Buying Shoes” (Shoes)
Cluster Pages:

• “Choosing the Right Boots for Winter” (Cluster: Boots)
• “Best Sneakers to Wear for Concerts” (Cluster: Sneakers)
• “Common Loafer Washing Mistakes & Things to Avoid” (Cluster: Loafers)

Turning a Cluster into a Topic for Market & Content Expansion and Market Depth

All cluster pages which be seen as subcategory pages (PLPs) that live under the Shoes topic or pillar. Ultimately, this doesn’t end there because topic clusters are all about expanding, each cluster can as be seen as a new topic that can be further expanded.

For example:

Pillar page: Sneakers can be a pillar page or topic and then we could expand.

Clusters Pages:

• “Hi-Top Sneakers”
• “Low Top Sneakers”
• “Mid Top Sneakers”
• “Slip On Sneakers”
• “Lace-less Sneakers”

Top Benefits of Topic Clusters & Semantic Search

1. Improved Search Engine Visibility

Search engines, particularly Google, have shifted from mere keyword matching to a focus on context and intent to determine relevance. Topic clusters organise content in a manner that aligns with ranking factors used by search engines in determining relevance. A well-structured cluster surrounding a specific topic enhances the likelihood of ranking for a broader array of related search terms.

2. Enhanced User Experience

The organisation of content into clusters facilitates seamless navigation through related pages for users. For instance, a user investigating “Heels for Sale” may naturally progress to “Choosing the Right Heels for Your Outfit.” This not only increases the duration of time spent on the site but also reduces bounce rates—both of which contribute positively to SEO performance.

3. Establishing Topical Authority

The publication of comprehensive and interlinked content surrounding a specific topic exemplifies depth and expertise. This approach positions your website as an authority within the niche, fostering trust among both users and search engines.

4. Facilitating Content Creation & Strengthened Internal Linking Structure

Adopting a cluster-based content strategy provides a strategic roadmap for future writing endeavors. Creating a robust internal linking framework enhances crawlability and disseminates link equity across related pages. By linking cluster pages back to the pillar page, and vice versa, you assist search engines in comprehending the interrelationships between your content pieces more effectively.

6. Support for Voice Search and Long-Tail Keyword Targeting

Topic clusters are exceptionally effective for targeting long-tail queries, a trend that is increasingly prevalent with voice search. Addressing specific subtopics in detail augments the likelihood of your content being selected as a direct response to a user’s query.

7. Facilitating Market Expansion

Over time, topic clusters may evolve into standalone subjects, which supports growth strategies by enabling the exploration of sub-niches, diversifying the content portfolio, and organically reaching new customer segments.

How Does Algorithm Use Topics & Clusters?

At Algorithm, we don’t just build content strategies—we engineer digital ecosystems that win market share. Topic clusters are not a trend; they’re a cornerstone of how we map intent, structure authority, and unlock growth in the search landscape.

Topic clusters form the backbone of Market Share Analysis, our proprietary tool designed to identify search opportunities and whitespace in your industry. By clustering content around high-intent topics, we uncover not only where the competition is weakest—but where your brand can lead. This isn’t guesswork. It’s a data-led approach to own the most commercially valuable terrain on Google.

Using Topics Clusters Approach & RACE Framework

But it doesn’t stop at content. Topic clusters integrate directly into our RACE Intent Framework—Reach, Act, Convert, and Expand—giving structure to how audiences discover, engage with, and buy from your brand across the entire funnel. Pillar content fuels Reach. Clusters drive Action. Together, they power scalable performance.

Strategic Partnership &  Beyond

Our model is different. We don’t sell retainers. We build strategic partnerships. RACE isn’t just a framework, it’s an agile approach to how we think and format partnerships. Every strategy we build with our clients is shaped by advisory depth, not off-the-shelf templates. That’s what we call Extreme Partnership, a fully embedded, agile collaboration model that’s beyond agency, beyond consultancy, and unlike anything else in South Africa.

The power of topics and clusters lies in the expansion of a product, service or should I say ‘topic’. Expanding of a broad topic or subject leads to endless possibilities that will help you in content creation, market penetration, and building authoritative expertise on a particular topic. Using this method is bound to establish any site or brand as an authoritative leader in the market and will likely reap the rewards in market share, traffic, and possibly leads.

Unlike traditional agencies, Algorithm works as an embedded strategic partner, building not just content but long-term organic growth engines.

Want to turn your content into a traffic-driving asset? Let’s build a semantic content strategy tailored to your audience.

Book a discovery session with Algorithm’s SEO and content strategy team.