Spiders are arachnids. They have eight legs, whereas insects have six legs.

Spiders eat other animals, which means that they are predators.

Many spider species weave webs, which they use to prey on other animals. Spiders weave their webs from a threadlike substance called silk. The back of a spider's body contains spinnerets that produce silk. 

A spider's web is stronger than steel. Only a few insects can escape the spider once caught in its web. Spiders often build a new web each day.