The text you provided is a specific type of Google Dork , which is a search string designed to find open directories on the web. Breakdown of the Query intitle:index.of
: The film is available for streaming on Amazon Prime Video. intitleindexof mkv 3 idiots work
When a web server (like Apache or Nginx) does not have a default landing page (like index.html ), it may automatically generate a list of all files in that folder. The text you provided is a specific type