There are many scnenarios where you do not want your web page to be indexed or followed by Google or any other search engines robots.
In those scenario, you can place meta tags under <head></head> as below.
<meta name="robots" content="noindex,nofollow" />
The noindex value instruct the search engines to not index the page in their database and nofollow instructs to not follow any links available on the page.
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