Portfolio diversification is a fundamental risk management strategy that involves constructing a portfolio with a variety of investments to minimize exposure to any single asset or risk factor. The core principle is "don't put all your eggs in one basket." By spreading investments across different asset classes (e.g., stocks, bonds, real estate, commodities), industries, geographies, and company sizes, investors aim to reduce the overall volatility and risk of their portfolio. The idea is that different assets respond differently to various economic and market conditions. When one asset performs poorly, another might perform well, offsetting losses and leading to more stable returns over time. For example, during an economic downturn, bonds might outperform stocks. Diversification also applies within asset classes, such as investing in various sectors of the stock market or different types of bonds. While diversification cannot guarantee profits or protect against all losses, it significantly reduces idiosyncratic risk – the risk associated with a single security or industry – thereby enhancing the portfolio's resilience and improving the likelihood of achieving long-term financial goals.