microscopes let us see things that we cannot see with the naked eye
light microscopes use light and lenses to form an image of a specimen and magnify it. they let us see individual cells and large subcellular structures.
electron microscopes use electrons to form an image. they have a much higher magnification and resolution than light microscopes.
resolution is the ability to distinguish between two points, so a higher resolution gives a sharper image.
electron microscopes let us see much smaller things in more detail.