There is also a newer technology called a "Language Model". From what I understand it is the most successful and most private, but also most controversial, method. It completely displaced and rendered redundant these "search engines", by polluting the interwebs with false information. Also, Google was stupid enough at one point to give reddit as the primary source for all information in searches, that's not a good method no matter whether you use an LLM, a locally-hosted LM, or a search engine.