How do I validate customer demand?

How do I validate customer demand is mainly about collecting behavioral evidence that a defined audience actively seeks and values a solution. A reliable approach is to combine search demand, competitor activity, interviews, waitlists, landing-page tests, preorders, paid campaigns, marketplace signals, and purchases. For example, offer a clear product, price, and call to action, then measure signups, deposits, qualified conversations, or orders. The main caution is that positive comments and likes are weaker evidence than committed customer actions. The final output should provide measurable proof of who wants the offer, why they want it, acceptable pricing, acquisition feasibility, and remaining uncertainty.