This powerful tool allows you to save Web pages including text, .PDF files, sound clips, graphics and HTML links directly to your hard drive, so you can view them offline at highly accelerated speeds. Computers have always been susceptible to various kinds of infections and parasites.
Computer programs contain bugs, or programming errors, that are bad.
They can also house worms, which are unpleasant or even computer viruses, which can be very damaging. Now the Internet itself has become infested with 'Web crawlers', spider-like programs that creep around the Web gathering and digesting electronic information but these new computer arachnids can be very good for you and your research, too. A Web crawler is a program designed to search and, in many cases, catalogue the Web. It does this automatically by following every link it comes across and memorizing what is on each page. Web crawlers are also referred to as Robots or Spiders.