Understanding LSI Keywords: How to Use Them for SEO Success

In the current digital age, having a strong online presence is essential for all of us.

We can achieve a strong online presence through SEO. Search Engine Optimization equips us with different tools and techniques to acquire a strong online presence.

In SEO, we use different techniques, one such technique is called keyword research where we identify words and phrases relevant to our business.

Now, In keyword research, we identify different types of keywords. For example, primary keywords, secondary keywords, etc.

Here, I am going to talk about a type of keyword that helps search engine to understand the context of a webpage’s content.

Yes, I am talking about LSI keywords.

What are LSI keywords, Why it is important for SEO, and How to use them? In this article, I am going to answer all these questions.

Ready? Let’s begin.

What is LSI?

LSI which stands for Latent Semantic Indexing is a mathematical technique to analyze the relationship between words and phrases.

Search Engines use this technique to understand the relationships between words and phrases so that they can give us more accurate and comprehensive results.

This is not a new technology. It was first introduced in the late 1980s as a way to improve information retrieval from databases.

LSI is not just used by search engines only but in a variety of natural language processing tasks, such as text classification, information extraction, summarization, statistical modeling, and so on.

So now we understand what LSI is, let’s dive in to find out about LSI keywords.

What are LSI Keywords?

LSI keywords are the related words and phrases that give a comprehensive understanding of the primary topic being discussed on a webpage.

These words and phrases are semantically related to the primary topic.

Let me help you to understand this concept using an example.

Suppose you are writing an article about “how to make a healthy salad”. Here your primary keyword is salad but there are different words as well that you can use in the article to help search engines understand the context of the article. For example, vegetables, nutrition, green, recipe, healthy, ingredients, etc.

LSI keywords are not synonyms of the primary keyword but rather words that are semantically related. These words help to provide a more complete picture of the topic.

Why LSI Keywords are important for Search Engines?

A word can have multiple possible meanings. Hence, finding a webpage based on the exact keyword match technique can lead to inaccuracies.

For example, suppose you are searching for a keyword called “apple” on the search engine. However, you didn’t mean about Apple fruit instead you mean about the Apple brand.

Now, how did the search engine figure out the correct webpage to present in front of you?

Well, the answer is through Latent semantic indexing (and a variety of other techniques as well).

Through LSI, search engines filter out webpages that use LSI keywords about Apple which could be laptops, phones, electronics, wifi, etc.

So, LSI keywords are important for SEO as it helps search engines to better understand the intent of a webpage. Once the search engine correctly understands the intent of a webpage, it provides more accurate results.

Now we understand LSI keywords and their importance in SEO, let’s learn how to find these keywords.

How to find LSI keywords?

There are different tools and techniques to find LSI keywords. Below I have explained the same.

When you perform a search on Google, scroll down to the bottom of the search results page, and there you see a list of related searches. These related searches are based on LSI technology that changes from time to time.

Competitor’s Content

Another way to find out LSI keywords is by analyzing your competitor’s web pages that are ranking higher and related to your target keyword.

Once you identify the web pages, look for the terms and phrases they are using. You can use tools like Ahref’s content explorer to identify related terms that appear on a webpage.

LSI Keyword Generators

You can take the help of different LSI keyword generator tools such as LSIGraph, Keywordtoo.io, Ubersuggest, etc.

These tools use the LSI technology to identify relationships between words and phrases.

Natural Language Processing

You can take the help of different natural languages processing tools like Word2Vec and GloVe.

These tools are more advanced and need some programming skills but they provide highly accurate and relevant results.


LSI keywords have a significant role in search engine optimization. They help search engines to better understand the context and intent of a webpage. These keywords help webmasters to enhance their website’s visibility and create a profitable business.

What are your thoughts on it? Feel free to post your opinion in the comment box down below.

I am a Search Engine Optimization Specialist taming the elusive search engine algorithms for over 6 years now. I have created some pretty darn impressive SEO projects. While I'm not busy dominating the...

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