Microscopy is the field of using a special instrument to observe things that are otherwise too small to see. If you yearn to study amoebas or bacteria up close, you'll want to pursue microscopy!
Microscopy is an area of scientific research that specializes in using microscopes. Both words are derived from the Greek roots mikros, "small," and skopein, "to examine." While microscopy is a technical field, if you make a habit of examining tiny things up close with the help of a microscope — drops of rainwater, an insect wing, your cat's fur — that's microscopy too.