Electron microscopy is a powerful imaging technique that uses a beam of electrons to visualize the microstructure of materials at very high magnifications. This technique is widely used in various fields such as material science, biology, and nanotechnology to study the ultrastructure of materials, cells, and nanoparticles. Electron microscopy allows for the visualization of details at the nanometer scale, providing detailed information about the morphology, composition, and crystal structure of the samples being studied.