The Internet is a collection of large and small computers generally called servers. They provide access to smaller collections of data that range from libraries of specific data to a place to buy widgets or play games with someone in the Ukraine. The World Wide Web is just a bigger, wider, fatter version of the same thing. Your modem For your computer to connect to the Internet you must have a modem. A modem is a telephone for computers.
Modems come in many speeds.
The absolute minimum speed is 28.8 kps, but I would recommend 33.6 kps. Fax capability is optional depending on your needs. The highest speed available is 56 kps or a modem with x2 technology. Few connections actually run at 56 kps, but may in the future. Future modem standards will be v.90 so a question about compatibility or free upgrades is in order.