Eukaryotic flagella are long, whip-like structures that extend from the surface of eukaryotic cells, such as those found in animals, plants, and protists. They are primarily used for locomotion, allowing cells to move through liquid environments. Eukaryotic flagella are composed of microtubules arranged in a specific "9+2" structure, which consists of nine pairs of microtubules surrounding two central microtubules. The movement of eukaryotic flagella is powered by the sliding of these microtubules, driven by motor proteins like dynein. This coordinated movement enables cells to swim or propel themselves in various directions. Eukaryotic flagella differ from prokaryotic flagella, which are simpler in structure and function.