What is the best answer?

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."

i don't care about the hunger games ripred wins (look up gregor the overlander)

what is this from, i cant tell what language he uses without the piece of literature