The outer covering ("skin") is called a synconium. On the inside of the synconium are hundreds of flowers, which each produce a fruit (one per flower), just like peaches, oranges, etc. have one fruit per flower. We typically call the synconium that is full of fruitS, a "fruit", but botanically, it is not the same. We wouldn't call a cluster of grapes "a" fruit - we would recognize it as a group of fruits. Same for bananas. With figs, that "Cluster" or "Bunch" comes neatly packaged in a synconium.