Investing in Financial markets has always been a complex task that involves making decisions under uncertainty, Traditional finance theories, such as the efficient market hypothesis (EMH) and modern portfolio theory (MPT), assume that investors are rational actors who aim to maximize utility and make decisions based on all available information. However, empirical evidence and behavioral finance research suggest that investors often act irrationally due to cognitive and psychological biases. This study aims to explore how these biases influence investor perceptions of risk and return, and how they impact overall decision-making in financial markets.