The difference between negative adverbs "못" and "안"!

Words

못 - can't ( Formality )

안 - wont , is not ( Formality )

나는 - as for me , me , I ( Pronoun )

수영하다 - to swim ( Infinitive Verb )

Phrases

나는 수영을 못해 - I can't swim ( Informal casual )