<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2007) (Learn how and when to remove this template message) </Td> </Tr> <P> 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, generally meant to catch its prey . </P> <P> Spider webs have existed for at least 100 million years, as witnessed in a rare find of Early Cretaceous amber from Sussex, southern England . Insects can get trapped in spider webs, providing nutrition to the spider; however, not all spiders build webs to catch prey, and some do not build webs at all . "Spider web" is typically used to refer to a web that is apparently still in use (i.e. clean), whereas "cobweb" refers to abandoned (i.e. dusty) webs . However, "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 . </P> <P> When spiders moved from the water to the land in the Early Devonian period, they started making silk to protect their bodies and their eggs . Spiders gradually started using silk for hunting purposes, first as guide lines and signal lines, then as ground or bush webs, and eventually as the aerial webs that are familiar today . </P>

Whats the difference between a cob web and spider web
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