+A **fin** is a flattened appendage on an animal or machine, primarily used for [propulsion](/wiki/propulsion), steering, or [stability](/wiki/stability). These structures are vital for movement through fluid mediums, commonly found on fish, marine mammals, and aquatic or aerial vehicles.
+## See also
+- [Fish](/wiki/fish)
+- [Tail](/wiki/tail)
+- [Wing](/wiki/wing)
... 1 more lines