Physical evidence refers to any tangible items or materials that can be observed and analyzed in a legal context. This includes objects like fingerprints, clothing, weapons, or any other physical items that can help establish facts in a case. Physical evidence is crucial in investigations as it can provide concrete proof of a crime or support a witness's testimony. In forensic science, physical evidence is collected and examined to draw conclusions about events or individuals involved. Techniques such as DNA analysis, ballistics, and fingerprint analysis are commonly used to interpret this evidence. Proper collection and preservation of physical evidence are essential to maintain its integrity for legal proceedings.