A spider web, spiderweb, spider's web, or cobweb (from the archaic word coppe, meaning spider) is a device created by a spider out of proteinaceous spider silk extruded from its spinnerets.owever, cobweb is used to describe the tangled three-dimensional web of some spiders of the theridiidae family. While this large family is also known as the tangle-web spiders, cobweb spiders and comb-footed spiders, they actually have a huge range of web architectures.