1. Introduction.- 2. Particle Optics of Electrons.- 3. Wave Optics of Electrons.- 4. Elements of a Transmission Electron Microscope.- 5. Electron-Specimen Interactions.- 6. Scattering and Phase Contrast for Amorphous Specimens.- 7. Kinematical and Dynamical Theory of Electron Diffraction.- 8. Diffraction Contrast and Crystal-Structure Imaging.- 9. Analytical Electron Microscopy.- 10. Specimen Damage by Electron Irradiation.- References.