Each Internet solution has its own advantages and drawbacks. Some offer fast uploads and downloads, while others offer fast speed only one way. Some require the use of a phone line, while others do not. Connection speed is measured in kilobytes per second, a rough measure of the amount of data they can transfer from an Internet server to a home user's machine in that relatively short amount of time. Naturally, the larger the number, the more data that can be transmitted.
Most computers come equipped with an analog modem.
No special wiring is required to make a connection and setup is a snap. Other solutions may require special technical expertise or even an installation team to show up at your house. Dedicated connections much faster and convenient than a standard modem. Requires a special ISDN line from the phone company and special terminal adapter, which often requires professional installation. ISDN is a completely different approach than a standard phone line.