Yes – That is to their prey! All spiders have a pair of poison glands with ducts that supply venom to the hollow jaws. Spiders will inject the venom and/or digestive juices into live or recently killed prey in order to feed. However relatively few spiders are dangerous to humans.
There are over 35,000 species of spiders found worldwide but only about 1,000 of those have been found in the continental U.S and Canada. Many of those were brought in from Europe.
The garden daddy long leg isn’t a spider. They have three broadly – jointed body regions a (head, thorax, and a segmented abdomen), one pair of eyes and they are non-venomous. They will feed on vulnerable insects and plant juices.