It’s ELI5!!
When a smooth tire goes over a very thin layer of water, that water acts just like a banana peel under your shoe, and you slip.
When a grooved/treaded tire goes over a layer of water, the raised parts of the tire act like spikes on your shoe that poke through the banana peel, so you don’t slip.
But you can’t run as fast in shoes that have big spikes, so if the road is free of banana peels, no spikes are needed.
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