> Google Dorking

Google's search operators (site:, filetype:, intitle:, and combinations of them) can surface content that's technically public but never meant to be easily found - exposed documents, misconfigured directories, forgotten login pages. It's just advanced search syntax, but the results it turns up can look like they came from somewhere darker than "a search engine." The technique is legal - it's just Google search. What you do with what you find is where the ethics and the law both start to matter.