Justification (Necessity) is the process of providing reasons, evidence, or facts in order to explain why a decision or action is necessary. This is usually done in order to convince another party of the validity of the decision or action. There are two main types of justification: moral justification and legal justification. Moral justification is based on ethical principles and norms that are accepted within a given society. This type of justification is used to provide a logical and ethical explanation for a decision or action. Legal justification is based on a law or other regulations and is used to explain a decision or action taken within the framework of the legal system. This type of justification is used to prove that a decision or action is in compliance with the law.