there are actually shoes that are called spikes. sportsmen wear spikes because when they are running the spikes underneath grip the ground so your not going backwards when naturally in normal shoes your going a bit backwards when you're walking or running.
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spikes are present in the sole of the sport shoes to increase friction between the hoe and the ground and to have traction & grip
so they have better traction on the grass/field. so if it were a rainy day, players (like in football) can make better cuts with the cleats.