This document provides an overview of cytology, including the objectives to identify cell structures, differentiate organelles in plant and animal cells, and understand the importance of cells. It reviews that cells are the basic unit of life and microscopy is used to view cells. The main types of cells - prokaryotes and eukaryotes - are introduced. Key organelles like the nucleus, cell membrane, and chloroplasts are examined in both plant and animal cell diagrams. The functions of these parts are discussed along with how cells reproduce through cell theory.