The evolution in methods used to store information is striking. To read information from these formats, you must use a specialized machine .
Electronic formats allow for the storing large quantities of information.
These discs contain digitized data readable by lasers. CD-ROMs are seeing enormous growth in the personal computer industry. They are relatively inexpensive to manufacture, and are cost-effective for consumers to purchase. The last category consists of a variety of resources which are covered in later lessons. Examples include World Wide Web pages, and electronic journals .