A Transmission Electron Microscope (TEM) is a powerful imaging tool that uses electrons instead of light to visualize tiny structures at the nanoscale. In a TEM, a beam of electrons is transmitted through a thin sample, allowing researchers to observe the internal details of materials, cells, and other specimens. This technique provides high-resolution images, revealing features that are not visible with traditional light microscopes. TEMs are widely used in various fields, including materials science, biology, and nanotechnology. They help scientists study the arrangement of atoms in crystals, the structure of viruses, and the properties of new materials, contributing to advancements in research and technology.