An investigator is someone whose job involves carefully searching for facts, clues, and evidence to answer important questions or solve problems. Police investigators examine crime scenes, interview witnesses, and piece together what happened during a crime. Scientific investigators conduct experiments and analyze data to discover how diseases spread or why buildings collapse. Insurance investigators determine whether accident claims are legitimate.

Good investigators share certain skills: they notice small details others miss, ask probing questions, and stay patient even when answers don't come quickly. A detective investigating a theft might dust for fingerprints, review security footage, and track down everyone who had access to the stolen item. A journalist investigating corruption might spend months reviewing documents, conducting interviews, and verifying sources before publishing a story.

Like following footprints through snow, investigators follow traces of evidence wherever they lead. You can use investigate as a verb: when your teacher asks you to investigate why plants grow toward sunlight, you're becoming an investigator yourself by conducting research and drawing conclusions from what you observe.