An electron microscope is a sophisticated instrument that uses beams of accelerated electrons rather than visible light to generate highly detailed images of specimens. These instruments operate by focusing the electron beam using electromagnetic lenses, which allows for significantly higher resolution than traditional optical microscopes. The interaction between the electron beam and the sample causes scattering, and the resulting signal is detected to reconstruct an image. This technology is critical in materials science and biology, providing visualization capabilities down to the nanometer and atomic scales, enabling the examination of subcellular structures and crystalline lattices.