Valuation describes how expensive a stock currently is relative to what the company is actually worth (measured by earnings, book value or other metrics).
Why does this matter?
Even a great company can be a poor investment if you pay too much for it. Conversely, a mediocre company can be attractive at a very low price. Valuation thus connects "how good is the company?" with "how much am I paying for it?"
What counts as good? This depends heavily on the price-earnings ratio (P/E) and similar metrics — lower values usually indicate a cheaper valuation, but always view it in the context of growth and quality.
MoatLens perspective: A central principle is: "Buy a great company at a fair price — not a mediocre company at a bargain price." The "margin of safety" (a price well below the estimated value) protects against misjudgments.
What to watch for: A low valuation alone is no reason to buy — sometimes stocks are cheap for good reason (e.g. declining profits). Always look at valuation together with the other 7 factors.
In MoatLens this explanation sits right next to the number — one tap away. And you see the ten-year trend instead of a single value.