A banana is an elongated, edible fruit – botanically a berry – produced by several kinds of large herbaceous flowering plants in the genus Musa. In some countries, cooking bananas are called plantains, distinguishing them from dessert bananas. The fruit is variable in size, color, and firmness, but is usually elongated and curved, with soft flesh rich in starch covered with a rind, which may have a variety of colors when ripe. The fruits grow upward in clusters near the top of the plant. Almost all modern edible seedless (parthenocarp) bananas come from two wild species – Musa acuminata and Musa balbisiana. Most cultivated bananas are M. acuminata, M. balbisiana, or hybrids of the two.

Cooking bananas are a group of starchy banana cultivars in the genus Musa whose fruits are generally used in cooking. They are not eaten raw and generally starchy. Many cooking bananas are referred to as plantains or 'green bananas'. In botanical usage, the term "plantain" is used only for true plantains, while other starchy cultivars used for cooking are called "cooking bananas". True plantains are cooking cultivars belonging to the AAB group, while cooking bananas are any cooking cultivar belonging to the AAB, AAA, ABB, or BBB groups. The currently accepted scientific name for all such cultivars in these groups is Musa × paradisiaca. Fe'i bananas from the Pacific Islands are often eaten roasted or boiled, and are thus informally referred to as "mountain plantains", but they do not belong to any of the species from which all modern banana cultivars are descended.