What are spiders in simple words?

1 : a wingless animal that is somewhat like an insect but has eight legs instead of six and a body divided into two parts instead of three and that often spins threads of silk into webs for catching prey.

What are the uses of spider?

All spiders are predators. Because of their abundance, they are the most important predators of insects. Spiders have been used to control insects in apple orchards in Israel and rice fields in China.