A more thorough explanation:

Forum Rei is a Latin term that refers to the place where a defendant lives or is domiciled. It is also known as Forum Rei Sitae.

• If a person living in New York is sued by someone in California, the forum rei would be New York because that is where the defendant resides.
• Similarly, if a company is sued by a customer, the forum rei would be the state where the company is headquartered or has its main office.

These examples illustrate how the forum rei is determined based on the defendant's residence or domicile. It is important because it determines which court has jurisdiction over the case and where the case will be heard.