Gayatri Spivak developed the theory of the subaltern, which refers to marginalized or oppressed groups who are denied a voice within society. She argues that subaltern groups, such as colonized people and women, cannot represent themselves due to the structures of power that silence them. Examples discussed in the document include the characters of Eklavya and Karna from Indian literature who faced caste-based oppression and were subaltern figures. The document provides context on Spivak's influential theoretical framework for understanding marginalized communities that lack political agency.