Yes a modem and an ISP (Internet Service Provider) are required for an internet connection. Depending on the type of internet the ISP will issue you a modem.
I do not think if you change providers your internet will change. The type of service will change only if you change the type of internet access. For example if you change from a modem to cable internet access.
DSL refers to a type of connection and broadband refers to an internet service. You can purchase a modem and a router independently, however many internet service providers prefer to provide you with one.
for dial up you need a modem, active telephone line and an internet service provider for high-speed u need a highspeed router and modem, and an active internet service provider ~zero
External modems are communication devices that computers utilize to connect to public networks like the Internet. A modem that sits inside the computer is called an internal modem, while modems that sit exterior, are external modems. The type of modem you require depends on the type of Internet access service you desire. There are two general categories: Basic dial-up service, and high-speed broadband service.
Cable, Wireless, T-1, T-3, OC3, and Satellite internet connections all require a cable router instead of using an ADSL modem router to access the internet.
Clients who utilize their own modem and switch ought to follow these means: Interface modem to coaxial or telephone jack. Plug in the modem power line. Interface switch to the modem with ethernet link. Plug switch power line into divider attachment. Call the supplier's tech desk support number and give them your modem MAC address so they can initiate administration.
DSL is short for digital line subscriber and is a type of internet. Even though it travels to your home via the phones lines, DSL is considerably faster than dial-up. It also requires a DSL modem. Many different service providers exist.
modem
A wireless modem is a modem which connects to a wireless network instead of to the telephone system. When you connect with a wireless modem, you are attached directly to your wireless ISP (Internet Service Provider) and you can then access the Internet. Basically it's another type of modem that lets you connect to the Internet anywhere in your home or workplace without using a wire/cable! Cool!
There are many different type of internet conections, and each have different requirements. Most internet can be set up down your BT telephone line, this includes Dial-up and broadband connections. If you live in a cable area then you can get internet throught this as well as cable TV. You must also have a computer, a modem (normally provided with internet bundle) and a few wires (also provided)
An acoustic modem is probably the slowest.