Answer:
An investigation is a detailed and systematic examination and recording of results made for the purpose of acquiring knowledge or gathering information. Scientific investigation is conducted in universities under the direction of professors or in research institutes, and the results of that research are published in recognized, peer-reviewed professional journals, in books or at conferences. Private investigation is the research that is conducted and funded by individuals or companies. A police investigation is carried out by the police for the purpose of informing alleged offenses and their results are often the basis for legal judgments.