Spiders are found on every continent of the world except Antarctica. There are around 40000 different species of spider. Most spiders make silk which they use to create spider webs and capture prey. Most spiders are harmless to humans but a few spider species, such as the black widow, can bite humans and inject venom.
Spiders will decrease the value of your expensive paint job or art work due to their cobweb.
Generally the spiders are venomous of it’s own prey. It catches the prey by silky cobweb decide by spiders. Though it is beneficial to environment by catching the small insects like flies, mosquitoes and etc,. It is consider nuisance and reduce the aesthetic value.