Fruits are the means by which angiosperms disseminate seeds. Edible fruits, in particular, have propagated with the movements of humans and animals in a symbiotic relationship as a means for seed dispersal and nutrition; in fact, humans and many animals have become dependent on fruits as a source of food.
In common language usage, "fruit" normally means the fleshy seed-associated structures of a plant that are sweet or sour, and edible in the raw state, such as apples, bananas, grapes, lemons, oranges, and strawberries. On the other hand, in botanical usage, "fruit" includes many structures that are not commonly called "fruits", such as bean pods, corn kernels, tomatoes, and wheat grains. The section of a fungus that produces spores is also called a fruiting body.
As excessive intake of added sugar is harmful and fruits are relatively high in sugar it is often questioned whether fruits are actually healthy food. It is in fact difficult to get excessive amounts of sugar (e. g. fructose) from fruits as they also contain fibers, water and have significant chewing resistance. An overview on numerous studies can be found here. Studies show that fruits are very satisfying (for example apples or oranges).