Stock valuation is the process of determining a company's intrinsic value based on financial performance and market conditions. It involves analyzing financial statements, growth prospects, and using methods like discounted cash flow analysis to estimate fair value. This helps investors make informed decisions about buying, holding, or selling stocks. Understanding stock valuation is crucial for identifying undervalued or overvalued stocks, assessing risk-reward profiles, and constructing diversified portfolios. It contributes to market efficiency by ensuring prices reflect fundamentals and helps companies make capital allocation decisions. Key concepts include intrinsic value, market value, and valuation ratios like price-to-earnings.