Someone who is born in the Island of Puerto Rico
They have their own unique customs and are able to speak Spanish fluently. They have American citizenship and are not 'black', with the majority of Puerto Ricans having Taino and Spanish(Spain) ancestry, although some have African ancestry. They do not 'hate on' Dominicans, Cubans, or any other nationality. Nor do Dominicans, Cubans etc. 'hate' on them, contrary to ignorant belief.
Mary: Hey whos that kid?
Jane: Its Jose, he's Puerto Rican
Mary: Wow, he's muy bueno!