Spiders are not insects but are arachnids, along with mites, scorpions, ticks. Most spiders in homes build neat, organized webs or sheets of webbing that lead into a funnel. The poisonous black widow and the brown recluse spiders both spin an irregular, tangled web in a dark, quiet location.
Knock down webs with a broom or duster. To help keep spiders from entering the home, seal cracks, inspect and repair window screens, and clean up any debris outdoors that may harbor spiders or their prey.