The basic unit of life is known as a cell. Cells are the fundamental building blocks that make up all living organisms, from single-celled bacteria to complex multicellular beings like plants and animals. Each cell is structured to perform specific functions, allowing organisms to grow, reproduce, and respond to their environment. There are two main types of cells: prokaryotic (such as bacteria) and eukaryotic (which include animal and plant cells). Cells contain organelles that carry out essential processes, like energy production, waste removal, and protein synthesis. Understanding cells is crucial in fields like biology, medicine, and biotechnology.