Final answer:
An organelle is a structure within the cytoplasm of a eukaryotic cell that is enclosed within a membrane and performs a specific job. Examples of organelles include the mitochondria and lysosomes.
Step-by-step explanation:
An organelle is a structure within the cytoplasm of a eukaryotic cell that is enclosed within a membrane and performs a specific job. Examples of organelles include the mitochondria and lysosomes. Mitochondria are responsible for producing energy to power the cell, while lysosomes function in digesting macromolecules and recycling worn-out organelles.