This document summarizes key aspects of cell structure and function. It describes the discovery of cells in the 17th century and defines cells as the basic unit of structure and function for living things. The main parts of the cell are then outlined, including the cell membrane, cytoplasm, organelles like the nucleus, mitochondria, Golgi apparatus, and lysosomes. The functions of these parts are explained. The document also discusses cell types, comparing prokaryotic and eukaryotic cells, and provides descriptions of DNA, RNA, and the process of cell division.