In common law, a writ is a formal written order issued by a body with administrative or judicial jurisdiction; in modern usage, this body is generally a court. Warrants, prerogative writs and subpoenas are common types of writs but there are many others
Under the Indian legal system, jurisdiction to issue 'prerogative writs' is given to the Supreme Court, and to the High Courts of Judicature of all Indian states. Parts of the law relating to writs are set forth in the Constitution of India. The Supreme Court, the highest in the country, may issue writs under Article 32 of the Constitution for enforcement of Fundamental Rights and under Articles 139 for enforcement of rights other than Fundamental Rights, while High Courts, the superior courts of the States, may issue writs under Articles 226. The Constitution broadly provides for five kinds of "prerogative" writs: 

• HABEAS CORPUS 
• CERTIORARI 
• MANDAMUS 
• QUO WARRANTO 
• PROHIBITION

THE WRIT OF HABEAS CORPUS is issued to a detaining authority, ordering the detainer to produce the detained person in the issuing court, along with the cause of his or her detention. If the detention is found to be illegal, the court issues an order to set the person free.
THE WRIT OF CERTIORARI is issued to a lower court directing that the record of a case be sent up for review, together with all supporting files, evidence and documents, usually with the intention of overruling the judgement of the lower court. It is one of the mechanisms by which the fundamental rights of the citizens are upheld.
THE WRIT OF MANDAMUS is issued to a subordinate court, an officer of government, or a corporation or other institution commanding the performance of certain acts or duties.
THE WRIT OF QUO WARRANTO is issued against a person who claims or usurps a public office. Through this writ the court inquires 'by what authority' the person supports his or her claim.
THE WRIT OF PROHIBITION is issued by a higher court to a lower court prohibiting it from taking up a case because it falls outside the jurisdiction of the lower court. Thus, the higher court transfers the case to itself.