The famous physicist Richard Feynman, the most famous physicist between the times of Albert Einstein and Steven Hawking, often stated that quantum mechanics is unquestionably correct in that accurate numbers to great precision can be computed from the theory.
On the other hand, according to Feynman, no one understands why quantum mechanics works or how it works inside, but we have a model that can be used to get useful results from the model.
A model such as quantum mechanics can explain what it does but no one is sure how it works, let alone why it works.