The Art of SEO: Mastering Search Engine Optimization (Theory in Practice) Highlight

Now, conduct a search on Google for ~zoo ~trips (the tilde is a search operator; more on this later in this chapter). Note that the boldface words that are returned match the terms that are italicized in the preceding paragraph. Google is setting “related” terms in boldface and recognizing which terms frequently occur concurrently (together, on the same page, or in close proximity) in their indexes.