Internet, IP, Web, and URL

The Internet is a collection of computers and cables that form a communications network.

The Web (World Wide Web) is a collection of HTML (web) pages on the Internet. The Web is the user part of the Internet.

The term Interweb is a combination of the words Internet and Web. It is most often used in the context of joking or sarcasm.

A URL (universal resource locator) is synonymous with Internet address.  A URL is usually a combination of code and text, such as 'http://www.google.com', but numbers are also allowed. A URL always starts with a protocol prefix like http://, but most browsers will type those characters for you. URLs are internally converted to IP addresses

IP address (Internet Protocol address), is a unique identifying number given to every device on the Internet. Like a car license plate, an IP address is a special serial number used for identification, such as  208.185.127.40 = www.about.com.

Bottom line, all URLs have an IP address, but not all IP addresses have a URL.