A Crime Scene Investigator (CSI) is a professional who collects and analyzes evidence from crime scenes. They work closely with law enforcement to document the scene, gather physical evidence, and take photographs. Their goal is to help solve crimes by providing crucial information that can lead to arrests and convictions. CSIs use various techniques and tools, such as fingerprint analysis, DNA testing, and ballistics, to examine evidence. They often testify in court about their findings, explaining how the evidence supports the case. Their work is essential in the criminal justice system, ensuring that justice is served based on scientific analysis.