The Observer Effect refers to changes that occur in a system when it is observed or measured. In physics, particularly in quantum mechanics, this phenomenon suggests that the act of observation can influence the behavior of particles, such as electrons. For example, when scientists measure the position of an electron, they may alter its momentum, leading to different outcomes than if it were not observed. This effect highlights the relationship between the observer and the observed, emphasizing that measurements can impact the state of a system. It raises important questions about the nature of reality and the limits of scientific observation, as seen in experiments involving quantum mechanics and Heisenberg's Uncertainty Principle.