A Chargesheet is a formal document of accusation prepared by law-enforcement agencies in India and Bangladesh. It is distinct from the First Information Report (FIR) (which is the core document that describes a crime that has been committed), usually refers to one or more FIRs, and charges an individual or organization for (some or all of) the crimes specified in those FIR(s).
Once the chargesheet has been submitted to a court of law, the court decides as to who among the accused has sufficient prima facie evidence against him to be put on trial. After the court pronounces its order on framing of charges, prosecution proceedings against the accused begin in the judicial system.
References
Chargesheet Wikipedia(Text) CC BY-SA