LSI means Latent Semantic Indexing. It’s an old technique that finds connections between the words in a piece of text. Researchers reported an earlier version of LSI in a 1988 information retrieval paper. This technique was developed to solve what researchers called the vocabulary problem.
LSI looks for patterns in how words appear across a collection of documents. It uses these patterns to identify relationships between terms, even when the terms do not appear together or use the same wording.
LSI Keywords Meaning
LSI keywords stand for Latent Semantic Indexing keywords. These are words and phrases related to the main topic of a page.
LSI keywords help search engines understand the context and topic of your content. They also help you cover a topic naturally instead of repeating the same keyword again and again.
Are LSI Keywords Still Relevant?
LSI keywords are an outdated SEO term that people often use for words and phrases related to a page’s main topic.
Take the example of our website. The main keyword is SaaS SEO Agency. The related keywords can be SEO for SaaS or B2B SaaS SEO.
There is one more important fact:
John Muller from Google said that it does not use LSI keywords as a ranking factor.
SEO professionals now use terms such as related keywords, semantically related keywords, or semantic keywords.
Modern SEO focuses more on satisfying search intent and covering a topic clearly than on forcing specific related keywords into the content. It’s useful for comprehensive coverage of a topic.
LSI Keywords vs. Semantic Keywords
People often use these two terms for the same idea. However, there is an important difference.
| LSI Keywords | Semantic Keywords |
| An older SEO term | A better modern term |
| Linked with Latent Semantic Indexing | Linked with meaning and context |
| Not a Google ranking factor | Useful for covering a topic |
| Often refers to related keywords | Can include words, entities, ideas, and subtopics |
SEO tools and even writers might use the LSI keyword for your business. But as long as you have an idea of what they’re talking about, go for it.
It just takes more effort to shift perspective when you’re thinking more about topics and connections rather than traditional semantic keywords.
Why Google Does Not Use Latent Semantic Keywords
Google doesn’t use latent semantic keywords because it never said that it is a ranking factor. It’s older technology that was designed for smaller document sets, not the entire web.
As a result, the ideas behind LSI keywords and LSI SEO are not strictly accurate.
However, Google still cares about semantics. In addition to identifying keywords, Google uses various forms of semantic analysis to understand search intent and a page’s overall topic.
Instead of latent semantic indexing, Google uses other methods:
- Knowledge Graph: Google’s knowledge graph is a semantic network that stores information about entities (such as people and places) and their relationships.
- Natural language processing (NLP): Google uses NLP to identify entities in content and queries. It also distinguishes subtle differences in meaning.
- AI and machine learning: Google applies an AI system to map words to concepts, understand context, and analyze text as a whole, rather than treating it as a simple word collection.
How We Define LSI Keywords and How Can You Find Them?
You do not need a special LSI keyword tool to find semantic keywords. You can discover related words and topics using a few simple methods.
1. Check Related Searches
Search for your main keyword on Google. Then, look at the related searches shown on the results page.
These searches can help you find:
- Related topics
- Common search terms
- Different ways people search for the same topic
This gives you more ideas for your content.
2. Study Top Search Results
Search for your main keyword and look at the pages ranking at the top.
Pay attention to their:
- Titles
- Headings
- Main topics
- Examples
- Common terms
- Questions
However, do not copy their content. Instead, use these pages to understand the topic better. Then, look for important questions or details they may have missed.
3. Use Google Keyword Planner
Google Keyword Planner is mainly designed for advertisers, but it can also help you find keyword ideas.
Enter your main keyword to see related search terms. You can also enter a website URL to find keyword ideas related to that page.
This can help you understand the words and phrases people use when searching for a topic.
4. Use SEO Tools
SEO tools like Semrush can also help you find related keywords and topics.
These tools study search results and suggest terms connected to your main topic. However, treat their suggestions as ideas.
You do not need to add every keyword the tool shows. Only use terms that naturally fit your topic and help explain it better.
Common Mistakes When Using LSI Keywords
People often make mistakes when using LSI keywords. Here are a few common ones:
- Thinking Google uses LSI keywords: Google does not use LSI keywords in the way many people think. It is better to use words and topics that relate to your main topic.
- Adding too many keywords: Do not add lots of keywords just to rank higher. Too many keywords can make your content hard to read.
- Using every keyword from an SEO tool: SEO tools can give you good ideas. However, you do not need to use every word they suggest. Only use words that fit your topic.
- Writing only for keywords: Do not focus only on keywords. Think about your reader first. Ask what they want to know and give them a clear answer.
The best way is simple. Use related words when they fit naturally. Then, focus on writing helpful and easy-to-read content.
How to Optimize for Semantic SEO Instead of LSI SEO
Focusing on Semantic SEO rather than LSI SEO is about moving away from simply matching single words that can be interchanged and towards a fully developed topic strategy with user intent and entity linking.
- Start with the main topic of your page.
- Then, ask what the searcher wants to know.
- Find the important subtopics, questions, entities such as people, places, products, or organizations, and related terms that support the main topic.
- Next, answer each important question clearly.
- Use trusted sources for facts and numbers. You can also add your own useful examples or first-hand knowledge when you have it.
- Most importantly, write naturally. Do not add a word only because an SEO tool tells you to use it.
Final Talk
LSI keywords are an old SEO term. Google does not use them as a ranking factor. However, the main idea behind them is still useful.
When you write content, focus on the main topic. Use related words and cover important questions. Also, think about what your readers want to know.
Do not add keywords just to please search engines. Instead, write clear, helpful, and complete content. This is a better way to improve your SEO and help your readers.
Frequently Asked Questions
What does LSI stand for in SEO?
LSI stands for Latent Semantic Indexing. It is an old information retrieval method that finds relationships between words in text. Latent semantic keywords is another phrase people sometimes use when discussing terms related to a main topic, though it does not accurately describe how Google handles them.
Does Google use LSI keywords?
No. Google has said it has no concept of LSI keywords. Therefore, you should not treat them as a special type of keyword or ranking factor
Are LSI keywords the same as synonyms?
No. Synonyms have the same or similar meanings. Semantic terms can relate to a topic without meaning the same thing.
How many LSI keywords should I use?
There is no set number. Use related terms naturally when they help you explain the topic. Do not follow a fixed keyword ratio.
How can I find LSI keywords?
The use of Google autocomplete, suggested related searches, and the Google keyword tool, as well as competitor research and various SEO tools, would reveal more keywords.
