Chargesheet is a summery made by the police which is submitted before the court. It contains the story in detail how a crime was committed. It also tells to the court, the role played by each individual in the commission of the crime. It contains the names of the accuses, the relevent sections of various laws which have been violated and the list of people who could not be charged, like if someone has died etc.
Once the chargeseet is filed before the court, the court sees if the person charged really needs to go for trial, whether the sections used by police r relevent or not? And lastly if someone needs to be discharged.
A chargesheet is filed under section 173 of Criminal Procedure Code.