Your toes are to your feet what your fingers are to your hands. They're the five digits you have on each foot.
Tetrapod, or four-limbed animals, have toes on their feet. The way those toes are used distinguishes these animals from each other. Some, like dogs, are digitigrade, walking on their toes. Humans are plantigrade, meaning we walk with our toes flat against the ground, our weight on the soles of our feet. You can also use toe to mean the front of your shoe, or as a verb meaning "to touch with one's foot."