There is no difference. English usually has many words to mean the same thing. They usually come from different languages which have influenced English. "Can" is used a lot more.

Hey Jonathan,! They both mean the same thing, though as Edward said, can is more ccommon among native speakers. "Can" is a modal auxiliary verb and "to be able to" is just verb ‘to be’ + the adverb ‘able’ + the infinitive ‘to’.

thank's phil :) CHYL : you're right :)

That means there is no stupid question.

Notice that "can" is defective, so it has no infinitive form, base form, or participles. It only has a present tense (which can also be used to refer to the future), a past tense, and a conditional.