Explanation:

A plaintiff is the party who initiates a lawsuit before a court. By doing so, the plaintiff seeks a legal remedy; if this search is successful, the court will issue judgment in favor of the plaintiff and make the appropriate court order.
Appellants is a person who applies to a higher court for a reversal of the decision of a lower court.
A defendant is a person accused of committing a crime in criminal prosecution or a person against whom some type of civil relief is being sought in a civil case. Terminology varies from one jurisdiction to another.
A prosecutor is a legal representative of the prosecution in countries with either the common law adversarial system, or the civil law inquisitorial system. The prosecution is the legal party responsible for presenting the case in a criminal trial against an individual accused of breaking the law.