ISO 9462 is the international safety standard for alpine (downhill) ski bindings. When a binding carries this certification, it means it's been tested to release consistently and reliably under the forces that happen during a fall. That predictable release is what protects your knees and legs from serious injury.
For any resort skier, ISO 9462 certification is non-negotiable. All legitimate alpine bindings sold in regulated markets should meet this standard, but it's worth verifying—especially if you're shopping online or eyeing suspiciously cheap deals. Non-certified bindings may not release when they should, or might release when you don't want them to.
One thing to keep in mind: if you're looking at touring bindings instead, they'll carry a different standard (ISO 13992) designed for uphill and downhill use. But for standard resort skiing, always confirm your bindings are ISO 9462 certified. It's the baseline assurance that your binding will perform when it matters most.