In more detail
Investing $100 at prices of 10, 8 and 12 buys 30.833 shares at an average cost of $9.73, below the average price of $10. It does not guarantee a profit, but it removes the pressure of timing the market.
Dollar-cost averaging means investing a fixed amount at regular intervals regardless of the price, so you buy more shares when prices are low and fewer when high.
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Investing $100 at prices of 10, 8 and 12 buys 30.833 shares at an average cost of $9.73, below the average price of $10. It does not guarantee a profit, but it removes the pressure of timing the market.