Black can refer to dark-skinned peoples of Africa, Oceania, and Australia or their descendants without regard for the lightness or darkness of skin tone, and who were enslaved by white people. Indigenous, here, refers to ethnic groups native to the Americas, and who were killed en masse by white people. People of Color is an umbrella term for non-white people, especially as they face racism and discrimination in a white dominant culture. BIPOC is meant to emphasize the particular hardships faced by Black and Indigenous people.
Biracial: Of, relating to, or involving people from two races; also having parents from two different races.