Importance of Electromagnetic Field and Its Visualization -- M axwell's Equations and Special Relativity -- Basis of Transmission Electron Microscopy -- Principles and Practice -- Principles of Electron Holography -- Microscope Constitution and Hologram Formation -- Related Techniques and Specialized Instrumentation -- Application -- Electric Field Analysis -- Magnetic Field Analysis -- Visualization of Collective Motions of Electrons and Their Interpretation -- Charging Effects and Secondary Electron Distribution of Biological Specimens -- Collective Motions of Electrons Around Various Charged Insulators -- Extension of Analysis of Collective Motions of Electrons -- Theoretical Consideration on Visualizing Collective Motions of Electrons -- Physical Constants, Conversion Factors, and Electron Wavelength.