I did not tag this question search, since according to tag-excerpt this tag is intended for built-in search functionality.

The tag-wiki and tag-excerpt were created by me, I've simply copied the content from meta.SO.

I guess it would be reasonable to expand scope of the tag to include search by external websites. Questions about searching receives answers using external search engines (most frequently Google) anyway.

@MartinSleziak I agree, that seems like a reasonable thing to add to the tag wiki

I have update the tag-excerpt for search and also added the tag to the question I've mentioned above.