A spiders sik-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 The silver argiope spider catches a beetle in its web of thread. The threads can be thick or thin, wet or dry. sticky or woolly. Each kind has a different purpose. Some webs create an egg case others provide hiding places The most common purpose of a new spider web however,is to catch food.