The difference between “which” and “what” lies in their usage. “Which” is used when you have a specific set of options to choose from, while “what” is used when the options are not limited or specific.
For example, “Which book do you want?” implies a choice among specific books, whereas “What book do you want?” is more open-ended.
Discover the difference between a simple and compound sentence, synecdoche and metonymy, trousers and pants.