1.   -- Web-weaving spiders use the webs to trap insects.

2.   Jumping spiders use their silk to build shelters, where they lie in wait for prey.

3.   Most spiders use their webs to trap prey, but a Lycos spider leaves its web to hunt.

4.   Those tags give thumbnail information on the site content, which the spider uses to determine the relevancy of that site to a submitted request.