The courts of law (including the Supreme Court) in India often "reserve" the verdicts after hearing is completed.
What's the purpose behind this practice?
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Good decision-making may take some time.
During the hearing the judges will hear/see what the parties say, and may:
Those are the official reasons.
In practice, if the court is not so independent or is corrupt, the judges may secretly consult whoever they see fit before reaching a decision (politicians, parties to the case who bribe them, and so on).
Appellate courts in particular often need to research the law and consider which precedents apply to the current case. The judges may need to discuss the proper decision among themselves. Then a decision needs to be written in many cases, and the wording again discussed among the judges of the court. All this can take considerable time.
Courts of original jurisdiction, where trials and some hearings take place, may still need to research prior cases, and consider what the proper decision is in the current case.