Tissue samples are small pieces of biological material taken from living organisms, including humans, animals, or plants. These samples are collected for various purposes, such as diagnosing diseases, studying cellular structures, or conducting research. Common methods for obtaining tissue samples include biopsies, surgeries, or non-invasive techniques. Once collected, tissue samples are often preserved and analyzed in laboratories. Scientists and medical professionals examine these samples under a microscope to identify abnormalities or to understand the underlying biology of a condition. This process is crucial for developing treatments and advancing knowledge in fields like medicine and biology.