A spider's silk-making organ has hundreds of small openings. Silk comes out of these openings as a liquid, and, as it reaches the
air, it becomes thread-like. These tiny threads combine to form a single,solid thread.
The spider can make many different kinds of thread The threads can be thick or thin, wet or dry, stick or woolly. Each kind has a different purpose. Some webs create an egg case. Others provide hiding places. The most common purpose of a spider web, however, is to catch food.