a system for finding information on the internet, in which documents are connected to other documents 

a fine net of thread made by a spider to catch insects

A spider had spun a perfect web outside the window.

a complicated pattern of things that are closely connected to each other

We were caught in a tangled web of relationships.

She discovered a web of intrigue in the company.

a piece of skin that joins the toes of some birds and animals that swim, for example ducks and frogs

LEARNit Dictionary