Spider is not an insect. It belong to the "arachnid" family, not the insect family. Other arachnids are scorpions, ticks, daddy longlegs and mites.
One easy way to tell the difference... the insects have six legs... a spider has eight legs.
Spiders have glands in their abdomens which produce silk. The silk is pushed through the tubelike spinneret to form webs to catch food and/or cocoons to protect their young.
A spider can produce a silky substance from tiny openings on its underside. To spin a web it starts by making a frame of this silk, attaching it to firm objects, such as twigs. When the frame is finished the spider fixes spokes to silk across it just like to spokes of a wheel. Then it arranges the sticky spiral thread across these spokes, leaving a platform of non-sticky thread in the middle where it waits for its prey. Though the webs look delicate, they are very strong.
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