Nails have a few useful functions.

Protection. Nails are protective plates to prevent cuts and scratches on the toes and fingers during our everyday activities.
Sensation enhancement. The fingers and toes contain nerve endings. They allow the body to process the information it gets every time the fingers touch something. The nail is the opposing force, so when the finger touches things, the nails make the sensitivity stronger.
Functioning. The nails are the flat versions of claws that help people dig, climb, scratch, grab, and do many other things. Maybe we don’t use all the abilities the nails give us, but our ancestors probably relied on them for survival. Finally, nails work like a tool when you need to grab something very accurately — for example, get a splinter out of the finger, peel an orange, or pick something very small up, like a needle.
Balance. Toenails also exert counter-pressure on our toes to help us keep balance when walking. The loss of toenails may lead to walking problems.

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