A hypothesis is a proposed explanation for a phenomenon, serving as a starting point for further investigation. It is often formulated based on existing knowledge and observations, allowing researchers to make predictions that can be tested through experiments or observations. The validity of a hypothesis is determined by its ability to withstand rigorous testing and scrutiny. In scientific research, a well-structured hypothesis is crucial as it guides the direction of the study. It helps in identifying variables and establishing relationships, ultimately contributing to the advancement of knowledge in various fields such as Biology, Physics, and Psychology.