Spider's are pretty useful when it comes to food. Spiders eat flies that bother us and other bugs as well such as a mosquito. Spiders use their webs to catch their prey. Sometimes spiders hide so then their prey would think that the spider is not there and fly into the spiderweb. The spiderweb is transparent so the prey won't see the spiderweb. After the prey lands on the web the spider wraps the prey into silk if they want to eat the prey later.
Just about every type of spider eats flies except one. It means that every type of spider is a carnivore except one type. The spider that does not eat flies is a herbivore. Canivores are animals that eat meat. Herbivores are animals that don't eat meat but eat plants. There still is an omnivore which are animals that eat plants and meat. Believe it or not, humans are also omnivores. That one type of spider will eat plants and other natural stuff. All the other spiders will have to wait to get their prey. This means that out of all three, being a carnivore is the hardest.