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.