A biopsy is a medical procedure that involves removing a small tissue sample from a patient for examination and diagnosis. The term "biopsy" can refer to both the process of taking the sample and the sample itself.

Histology is the study of the microscopic structure of tissues and organs in plants and animals. It involves sectioning, staining, and examining tissue samples under a microscope to visualise tissue structure and any changes it may have undergone. Histology is also known as microscopic anatomy or histochemistry.