What is the difference between determinism and fatalism and how do they influence our understanding of free will?

Determinism is the belief that all events, including human actions, are determined by causes external to the will. Fatalism, on the other hand, is the belief that all events are predetermined and inevitable. Determinism suggests that our actions are influenced by external factors, while fatalism implies that our actions are already predestined. Both concepts challenge the idea of free will by suggesting that our choices may not be entirely within our control.