The full form of FIR is "First Information Report". It is a written document prepared by the police when they receive information about the commission of a cognizable offense. An FIR is the starting point for an investigative process for a specific crime. It contains all the crucial information about a criminal offense, such as the name of the victim or the person making the complaint, offense description, time and place of the crime, witness statements (if any), and the name and description of the offender if identified.

Filing an FIR is necessary as it assists in the criminal justice process. The police can commence the investigation only after registration of the FIR. After registration, the content of the FIR cannot be altered except by a supreme court or high court decision. An FIR is a very important document because it helps in the process of criminal justice. It can be used to support the complainants and other witnesses testimony and is admissible in court as proof of the Polices first tip.

The procedure to file an FIR is stated in Section 154 of the Act Code of Criminal Procedure, 1973. When details about a cognizable commission offense are provided orally, they must be written down by police. If the police are not giving a copy of the FIR, always demand a copy as it is your right to receive it at no cost.