A flagellum is a whip-like appendage found on the surface of some cells. What is their primary purpose?

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A flagellum (or flagella for plural) is the slender threadlike "leg" on the surface of the cell. The primary purpose of the flagellum is locomotion, which means that it helps the cell move.
The rough endoplasmic reticulum (ER) is the organelle responsible for membrane production. The rough ER is the part of the endoplasmic reticulum covered in ribosomes, which gives it its rough appearance. The rough ER is also the site of protein synthesis.
The Golgi apparatus is the organelle responsible for transporting proteins from the endoplasmic reticulum throughout the cell.
The smooth endoplasmic reticulum (ER) is the organelle responsible for detoxification of medications and poisons in the cell. Its other functions include synthesis of carbohydrates, lipids, and steroid hormones; and the storage of calcium ions used for muscle contraction.
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A Flagellum Is a Whip-Like Appendage Found on the Surface