The food chain is like a game of "who eats whom" between all the animals and plants in an area. It starts with plants because they make their own food using sunlight, water, and soil. Then, herbivores come and eat different plants. Herbivores are animals that only eat plants.
Next, carnivores come and eat the herbivores. Carnivores are animals that only eat other animals. Omnivores are animals that eat both plants and animals. This is why some animals are herbivores or carnivores, and some are omnivores.
Sometimes there are even things that eat the dead animals, called decomposers. They break down the remains of the dead animals and plants, and return the nutrients to the soil. This is important to keep the food chain going!
So, remember: plants make their own food, herbivores eat plants, carnivores eat herbivores, and decomposers break down dead plants and animals. It's like a big game of "who eats whom" in nature!