system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What purpose do toenails serve?

I understand the purpose of fingernails, but you can't do with your toes what you can do with your fingers.
gpt
I would wager to say that they're largely vestigial at this point. They originally served the same purpose as fingernails because our distant ancestors likely actually used their feet for things aside from walking (kind of like moneys).

At this point, it really just provides an extra layer of protection from falling objects and a point of frustration for when they become ingrown.

Edit: In case anyone hasn't come across the word, "Vestigial" is a term used to describe a feature or behavior which once had a biological purpose but is no longer used and has become "useless" to the organism that possesses it. A few other examples (some of which Darwin pointed out) are: wisdom teeth (they used to be very important because most humans would lose some of their teeth during their lifetime), male nipples, body hair (it used to be much thicker and helped keep us warm), ear muscles, tonsils, and the tail bone (coccyx).