What search engine does Craft CMS come with? New to Craft CMS. Our corporate website has been built using Craft. When using the site search, it is not finding all pages within the site. Wondering what the search engine technology is and how to re-index or broaden. Also, not crazy about the search results (SERP) display. What customizations are available?
The Craft CMS documentation has some technical information about how searching works with the various Craft ElementTypes.

There is also documentation on setting up a search form.

If you're looking for a more complete and full-featured search solution, SquareBit's Search Plus is an excellent option.