What are the different microscopic preparation for microscopic examination?

There are tons of things that are microscopic, such as bacteria, viruses and cells. I would say that anything too small to see with the human eye would be considered "microscopic".

Microscopic is a term you have probably heard before. It doesn't just mean an object is small, it means it is so small that the only clear way of seeing it is by using a microscope.

Macroscopic strutures may be examined wtith the unaided eye and Microscopic strutures cannot be clearly observerd without a mircoscope.

Gross examination is performed without the aid of magnification. Microscopic examination is performed on slides of tissue samples on the microscope.

Microscopic examination of bone marrow can reveal leukemia, granulomas, myelofibrosis, myeloma, lymphoma, or metastatic cancers, bone marrow infection, and bone disease.