The P/S Ratio is a key metric used to evaluate a company's stock price in relation to its revenue. A lower P/S Ratio may indicate an undervalued stock, while a higher ratio could suggest overvaluation. Investors use this ratio to compare companies within the same industry, especially for firms with little to no earnings. It is particularly useful for analyzing companies in early growth stages where profitability has not yet stabilized. Additionally, the P/S Ratio is often preferred over the P/E Ratio when assessing companies with volatile earnings.