Spiders are carnivorous predators, sometimes even cannibals. The main prey is insects that are trapped in the nets he made. You can see that the Spider is preying on insects.
even insects larger than his body will be preyed on. but the uniqueness of the Spider is that it doesn't have a chewing mouth. The spider you see is harmless. these are spiders that you often find in the bush and in the house. but there are some species of Spiders that have can. and it is dangerous for humans.
Spiders have silk threads to make their nests. When an insect is trapped, it will pounce on the insect.