An electron microscope is a type of microscope, a scientific instrument which is used to magnify things on a fine scale. Electron microscopes use a particle beam of electrons to illuminate a specimen and create a highly-magnified image. They have much greater resolving power than light microscopes that use electromagnetic radiation and can obtain much higher magnifications of up to 1 million times, while the best light microscopes are limited to magnifications of 1000 times. Both electron and light microscopes have resolution limitations, imposed by the wavelength of the radiation they use. The greater resolution and magnification of the electron microscope is because the de Broglie wavelength of an electron is much smaller than that of a photon of visible light. The electron microscope uses electrostatic and electromagnetic lenses in forming the image by controlling the electron beam to focus it at a specific plane relative to the specimen.
This manner is similar to how a light microscope uses glass lenses to focus light on or through a specimen to form an image.

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