Definition
An epiphenomenon is a secondary phenomenon that occurs alongside or results from a primary phenomenon, but has no causal influence on it. It's like a side effect. It's a byproduct that doesn't affect the main process. Think of it like the steam from a train – it's visible, but it doesn't drive the train. The classic example is consciousness, some argue it's just a byproduct of brain activity. It raises questions about cause and effect.