An animal cell is a basic unit of life found in animals. It is a eukaryotic cell, meaning it has a defined nucleus that contains genetic material. Animal cells are typically round or irregular in shape and lack a rigid cell wall, which allows for flexibility and movement. They contain various organelles, such as mitochondria for energy production and ribosomes for protein synthesis. The cell membrane surrounds the animal cell, controlling the movement of substances in and out. Other important organelles include the endoplasmic reticulum for processing proteins and lipids, and the Golgi apparatus for packaging and distributing materials. Together, these components work to maintain the cell's functions and overall health.