What are factor or smart-beta funds?

Factor or "smart-beta" funds sit between plain index funds and active management. Instead of weighting stocks purely by size, they tilt toward characteristics — called factors — that research links to higher long-run returns, such as value (cheap stocks), size (smaller companies), momentum (recent winners), quality (profitable, stable firms), and low volatility. They follow rules rather than a manager's hunches, so fees are lower than active funds but usually higher than a plain index fund. The catch: factor premiums are unreliable and can underperform the broad market for many years, testing your patience exactly when it's hardest to stay put. They aren't a free lunch — you're trading the certainty of matching the market for the chance to beat it. For most investors, a low-cost broad index fund is the simpler core, with any factor tilt kept small and long-term.