A court, in law, is a part of the government in which people come together to decide how to apply the country's laws to a specific situation, especially when there is an argument over how to apply the law. Some disagreements a court may decide are whether a person is guilty of a crime, who is the legal owner of property, or who the children of two divorced parents should live with. A court is usually in a special building called a courthouse.
A trial is where two people or two groups of people argue in a court. 
A prosecutor is a lawyer who argues in a court that the defendant should be found guilty of a crime. Prosecutors usually represent the government.
A lawyer may help the defendant in trial. acting as a criminal defense attorney. 
Evidence is something that is used to support an argument. It gives examples of why something is true. 

When there is a trial the prosecutor can think the person they are trying to get found guilty of a crime is guilty for the simple fact that  they were there when something bad happened or that they are to blame even if there only a bit of evidence.
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