In this thesis, the basic principles of electron microscopy, the differences between scanning electron microscopy (SEM) and transmission electron microscopy (TEM), are described. An overview of the current applications of electron microscopes is provided, with a focus on their use in the preparation and analysis of cosmetic products. The application of electron microscopy in cosmetics plays a significant role in the development, analysis, and quality control of cosmetic products. Electron microscopes, including SEM and TEM, enable detailed examination of the microstructure and surface characteristics of cosmetic preparations. SEM is used for analyzing the surface topography and composition of cosmetic samples, allowing researchers to identify and optimize ingredients that contribute to the desired properties of products, such as texture and appearance. TEM, on the other hand, enables the study of the internal structure of cosmetic ingredients at the molecular level, which is crucial for understanding how different ingredients interact with the skin and hair. Through the application of electron microscopy, scientists can identify microscopic particles and impurities, improve formulations, and ensure consistent quality and safety of cosmetic products. This technology also aids in the research of new ingredients and their effects, contributing to the development of innovative cosmetic solutions that meet high standards of effectiveness and safety.