A biopsy is a medical procedure used to remove a sample of tissue for examination. There are several techniques for performing a biopsy, including needle biopsy, where a thin needle is used to extract tissue, and surgical biopsy, which involves removing a larger section of tissue. The choice of technique depends on the location and type of suspected disease. Another common method is the endoscopic biopsy, where a flexible tube with a camera is inserted into the body to collect tissue samples from internal organs. Biopsies are essential for diagnosing conditions like cancer and determining the best treatment options.