Is Guam part of the USA?

Could you please clarify for me if Guam is indeed considered a part of the United States of America? I've heard conflicting information on this matter and I'm eager to get a definitive answer. Is Guam an unincorporated territory, a state, or something else entirely within the American political system? I'm particularly interested in understanding its relationship with the federal government and how it fits into the broader picture of the USA. Thank you for your assistance in clarifying this matter.