The answer to 'what is spider' is a spider is a type of arachnid, an invertebrate animal that has eight legs and a body divided into two parts. Spiders are found all over the world and are known for their ability to spin intricate webs to catch prey. There are over 45,000 different species of spiders, ranging in size from less than 1 millimeter to over 10 inches in leg span.
Spiders play an important role in the ecosystem by helping to control insect populations. While some spiders are venomous and can pose a threat to humans, the vast majority of spider species are not dangerous and are simply a natural part of the outdoor environment. Proper identification and understanding of spider behavior is key to managing them safely around your home.