Coherentism is a theory in epistemology that suggests beliefs are justified if they fit together in a coherent system. Instead of relying on foundational beliefs, coherentism emphasizes the relationships and connections among various beliefs. A belief is considered justified if it is supported by other beliefs within the system, creating a web of interconnected ideas. This approach contrasts with foundationalism, which posits that certain basic beliefs serve as the foundation for all other knowledge. Coherentism allows for a more flexible understanding of knowledge, as it focuses on the overall coherence of beliefs rather than their individual justification.