There is no danger of hackers getting into your business computer. The Internet is a world wide system of computer networks. Telephone lines connect these computers. Besides offering Web access, the Internet also provides FTP, Archie and other file transfer and archiving protocols. The terms Internet and World Wide Web have come to mean the same thing in the minds of a lot of people.
Most folks use the terms interchangeably.
The number of people using the Internet is a moving target. That's a nice neighborhood to be in if you want to sell a product or service. The WWW is the World Wide Web and a part of the Internet. It is a global network of information connected by URLs and hyper-links. A modem is an electronic device that converts the digital signals your computer sends to the phone connection to analog signals and vice versa.