Sister Outsider is a seminal collection of essays and speeches by Audre Lorde, published in 1984, that explores the intersections of race, gender, sexuality, and identity. The work is notable for its powerful examination of the experiences of Black women and its call for social justice, self-acceptance, and community building. Lorde's writings challenge oppressive societal norms and encourage individuals to embrace their unique identities as a means of fostering empowerment and understanding.