You should think of them as pest control specialists. They constantly search for insects. Wolf spiders are special friends of the gardener and farmer. They attack many common garden pests. Spiders can control stored-grain pests, bedbugs, cotton worms and pea aphids, to name a few.
All arachnids have exoskeletons like insects, but they have no antennae or wings.
The following illustration shows a typical spider, next to a typical insect. Most spiders have 8 eyes. The pincher-like mouthparts are modified into hollow fangs which inject venom into prey. Prey consists of insects, mites and other small arthropods. Females are usually larger than males.