An Internet Service Provider (ISP) provides access to the Internet. This access can be via cable, DSL, or dial-up. All devices with an Internet connection make each request through an ISP to access servers where they can view Web pages and download files. The servers provide these files through their ISP.

Examples of ISPs include AT&T, Comcast/Xfinity, Verizon, Cox, and NetZero. These ISPs can be wired directly to a home or business or sent wirelessly via satellite or other technology.

Most homes and businesses have a device that connects to the internet. Through that device, phones, laptops, desktops and other internet-enabled devices reach the rest of the world, and that happens through an ISP.

Here's an example of the role an Internet Service Provider plays when you download files and access web pages over the Internet.