Answer:
Mr Jill is the Defendant.
Step-by-step explanation:
Defendant is the person who is been sued in a court law. Defendant can be a single person, or a company or any institution. When plaintiff accuses a person in a court of law, the other person becomes the defendant.
In this example, Andrew was in a contract will Jill in which it was written that Jill will provide Me Andrew with a custom ios application for the future forum but Mr Jill failed to provide him that app. So Mr Andrew sued him in court of law that made him a defendant.