This is a very short commercial that shows the main physical differences between what we call "bananas" in Spanish ("plantains" in English) and what we call "plátanos "("bananas" in English):
Plantains are male bananas and they are commonly used to cook. And bananas are the sweet fruit. Here you have an article about plantains:
And here you have a more detailed report about nutritional differences between bananas ("plátanos") and plantains ("bananas"):
