Cell structure refers to the organization and components of a cell, which is the basic unit of life. Cells are made up of various parts, including the nucleus, which contains genetic material, and organelles like mitochondria that produce energy. The cell membrane surrounds the cell, controlling what enters and exits. Different types of cells, such as plant and animal cells, have unique structures. For example, plant cells have a rigid cell wall and chloroplasts for photosynthesis, while animal cells do not. Understanding cell structure is essential for studying biology and the functions of living organisms.