Spiders have eight legs, insects have only six.
Spiders have two body parts, a head and an abdomen, while insects have three body parts, a head, a thorax, and an abdomen. Insects have antennae, spiders do not. All spiders eat meat, which means they're carnivores. Spiders catch their food in a lot of different ways. Some spiders pounce on their prey, others lasso insects with a piece of sticky silk, and many spiders spin webs.