Spiders are not insects. Instead, they are arachnids. This can be seen in the fact that they have eight legs instead of six. In addition, spiders have no wings. 

Spiders are predators that eat insects. All spiders are capable of producing silk, but only some of them use it to build intricate, hanging webs for preying on insects.

The cross spider is one of these web-building spiders. When its web is ready, the spider retreats to a hidden location and waits for an insect to fly into the web. When this happens, the insect is caught and the spider uses its poison to tranquilize its prey.