Fruit types can be categorized into several groups based on their structure and development. The main categories include simple fruits, aggregate fruits, and multiple fruits. Simple fruits develop from a single ovary and can be further divided into fleshy fruits like apples and berries, and dry fruits such as nuts and legumes. Aggregate fruits form from multiple ovaries of a single flower, like raspberries and blackberries. In contrast, multiple fruits develop from the ovaries of multiple flowers, as seen in pineapples and figs. Understanding these categories helps in identifying and classifying various fruits.