A free papers search engine Someone told me that there is a search engine that gets you most of research papers I may need for free.
He told me that this search engine is working based on using other members access to researches and make it available for all.
I tried searching for this search engine, but I could not find it.
Which search engine is it?
Your friend is probably thinking of Sci-Hub. Warning: it's likely illegal, including to use the service (as opposed to uploading stuff onto it), in most jurisdictions. If it's not already illegal in your jurisdiction, the trend is towards illegality (i.e. lawsuit after lawsuit has been ruled on, and they are usually in favor of the copyright holder).
If you want to do things legally, try something like Unpaywall, or ask your local librarian. Librarians are incredibly good at finding papers, and they can often access something for free even if you can't.