This document provides an overview of cell structure and types of cells. It defines a cell as the smallest unit capable of life functions. Cells are categorized as prokaryotic or eukaryotic. Prokaryotic cells like bacteria are simpler without nuclei or organelles, while eukaryotic cells like plants and animals are more complex with nuclei and membrane-bound organelles. The document describes the structures and functions of the cell membrane, nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, and other organelles. It compares plant and animal cells, focusing on differences in cell walls and chloroplasts.