Food chain and food web are not the same thing. There are some basic differences in between them. The differences between the food chain and food web are given below:
Food chain refers to a natural system by which energy is transmitted from one organism to another.
On the other hand, food web refers to a bunch of food chains that make up an ecosystem. It is a mass of connected food chains that are interlinked at various points.
A food chain only follows just one path as animals find food. For an example, an eagle eats a snake which has eaten a rat, which has eaten an insect, which has eaten a grass or leaf.
On the other hand, a food web shows many different paths where plants and animals are interconnected. An eagle might also eat a mouse or a squirrel or a frog or some other animals. The snake may eat a beetle or a caterpillar or some other animals in the food chain.