Histopathology is the examination of biological tissues in order to observe the appearance of diseased cells in microscopic detail. Histopathology typically involves a biopsy, which is a procedure involving taking a small sample of tissue, usually undertaken by a pathologist, who are experts in diagnoses of diseases. Histopathology alludes to the infinitesimal assessment of tissue so as to contemplate the appearances of illness. In particular, in clinical medication, histopathology alludes to the assessment of a biopsy or careful example by a pathologist, after the example has been prepared and histological segments have been put onto glass slides. Interestingly, cytopathology looks at free cells or tissue smaller scale parts (as "cell squares").