Plantains are green bananas or cooking bananas that belong to the Musa genus and can be eaten ripe or unripe. They are harvested unripe when nearing maturity. They are very low in sugar and are usually fried or baked. Here is a plantain vs. banana comparison based on few points.
More Details: https://www.findatopdoc.com/Top-Videos-and-Slideshows/What-Does-a-Plantain-Taste-Like