Okay kiddo, have you ever seen ants fighting over a piece of candy or a crumb of food? That's kind of like what food competition is, but with bigger animals, like people or animals in the wild.
You see, in nature, there's a limited supply of food, and lots of animals need to eat to survive. So if there's not enough food to go around, animals have to compete with each other to get enough to eat.
Sometimes animals compete by trying to be faster or stronger than their competitors, so they can get to the food first. Other times, they use different strategies, like hiding their food or trying to scare off their competitors.
People also compete over food, especially in places where there's not enough to go around. Sometimes this can lead to fights or arguments, but usually we try to share and make sure everyone gets enough to eat.
Overall, food competition is just animals, including humans, trying to get the food they need to survive when there's not enough to go around.