What is the difference between a berry and a real fruit?

Berries are also fruits. But unlike potatoes, tomatoes, cucumbers, apples, etc., berries have a slightly different function. Vegetable and fruit fruits have a supply of nutrients for seed germination. They also serve to protect the seed from drying out. But in berries it is unnecessary. They are necessary to attract birds. Birds eat the berry together with the bone and after a while the bone leaves their body in a natural way. The seed is protected from digestion and grows quietly far from the tree. This ensures the process of spreading trees and bushes.