Originally Answered: LSI Keywords are essentially keywords associated with the keyword that you simply hunt for on search engines like Google. In short, they're keywords that are associated with your main term. they assist support your content and provides it more context for both the search engines and your users.
Latent semantic indexing (LSI) keywords are simply keywords associated with the subject your page is about, and with Google’s update, they'researching for more of a subject match rather than a keyword match. How they are doing this is often by trying to find LSI keywords. the concept is that you simply would just naturally include them as you write. So by simply writing naturally, you may have found them. Say as an example you have got a traveling site. the thought is that you simply would naturally include related words like “flights”, “accommodation”, “visit”, “great place for a vacation” within the content. These are LSI keywords for your “traveling” topic.
Semantic search may be a data searching technique during a which a look query aims to not only find keywords, but to work out the intent and contextual meaning of the words an individual is using for search. And here's where things get a bit bit fun with LSI Keywords: LSI keywords change all the time supported this trend - like "Oculus Rift" is certainly not semantically related with "Virtual Reality" 5 years ago; but fast forward to today, Oculus Rift is largely a synonym of video game.
Bonus Edit
One thing I should point out:
LSI Keywords aren't synonyms. Instead, they’re terms that are closely tied to your target keyword.
For example, take a word like: “jogging”. Well, “running” is simply a synonym of “jogging”.
Now: There’s nothing wrong with using that synonym in your article, but it’s not an LSI Keyword. LSI keywords for “jogging” are things like: “shoes”, “cardio” and “5k”.
With that, here’s the way to find LSI keywords.
Best Practices
Google Autocomplete is one in all the fastest and easiest ways to uncover LSI terms to use in your content. You can also try Keyword Tool and UberSuggest. (Recommended by Backlinko) for LSIGraph: LSI Keyword Generator (it’s Free) --- “Searches Related to…” is analogous to Google Autocomplete. But rather than Google suggesting keywords as you search, they furnish you related terms at the underside of the search results. (It’s the enclose the underside of the SERP)
Google Correlate may be a long-forgotten tool that Google hasn’t been updated in years. However - it still works! Use LSI Keywords Throughout Your Article
Now that you simply have an inventory of LSI Keywords, how does one use them?
I’ve tested this quite an bit. And my takeaway is: it doesn’t really matter.
In my experience, as long as Google sees these terms somewhere on your page, you’re good.
So be at liberty to incorporate your LSI terms:
In your title tag
In image alt text
As a H2 or H3 subheader
In your H1
In the content itself