The default and “hidden” boolean operator in a standard google search is

The default and “hidden” Boolean operator in a standard Google search is “”AND OPERATOR””

Further Explanation

Boolean Operators are words or symbols used as conjunctions to combine or exclude keywords in a search. Using these operators, you are able to focus your search on the results that will be most helpful. Google also has a few additional operators that work to refine results.

AND

Limit resultsVegetarianism AND obesity  

(Search for content that contains both vegetarianism and obesity.)

AND Operator

Use AND searches in Google to search for all the search terms you specify. It's helpful to use AND when you want to make sure that the topic you're researching is the topic you get in the search results. As an example, say you search the word Amazon on Google. The results most likely show you things on Amazon.com, like the homepage of the site, its Twitter account, Amazon Prime information and other things you can buy on Amazon.com.

However, if you were instead looking for information on the Amazon rain forest, even searching for Amazon rain forest might give you results that are only about Amazon.com or the word Amazon in general. To make sure each search result includes both the words Amazon and rain forest, use the AND operator.

Examples:

●Amazon AND rain forest

●sausage AND biscuits

●news AND war AND president

In each of these examples, search results include web pages with all the terms connected by the Boolean operator AND.

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Keywords: google search, AND operator, Amazon, logical operator, Boolean operators