Organelle: Definition, Functions, and Importance

Provide the definition of organelle, its advantages, functions, and importance for cells.

What is an organelle? What is the advantage of having organelles? Which organelles/structures do plant and animal cells contain? Are there any organelles/structures that are only in one or the other? What is the main function of one of the types of organelle? What types of cells in the human body contain large amounts of this organelle? If this organelle was damaged, what cellular process would be disrupted? What might happen to the cell?