The main function of the microscope is to see microscopic objects, or small objects so small the naked eye can't see it. It magnifies the object so our eye can see it.
After discovering and improving the microscope, Robert Hooke discovered cells. This is just one example of how it changed the study of organisms. With the microscope, we could see and find microscopic life like bacteria and see the cells, shape, color, and other materials such as the organelles the organisms were made of.