A biopsy is a medical procedure where a small sample of tissue is taken from the body to be examined under a microscope. This helps doctors diagnose diseases, especially cancers, by looking for abnormal cells. The sample can be collected in various ways, such as through a needle, during surgery, or with a special tool, depending on the location of the tissue. After the sample is collected, it is sent to a laboratory where pathologists, who are doctors specializing in diagnosing diseases, analyze it. The results can provide important information about the presence of conditions like cancer or infections, guiding treatment decisions and patient care.