A software application for retrieving, presenting, and traversing information resources on the World Wide Web (Wikipedia).

A global system of interconnected computer networks that use the standard Internet Protocol Suite (TCP/IP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks of a local to global scope that are linked by a broad array of electronic and optical networking technologies (Wikipedia).

An application that searches for, and retrieves, data based on some criteria, especially one that searches the Internet for documents containing specified words (Wiktionary).

The "address" of any particular web page or other element of content on the Internet. The URL includes a Domain Name which is a unique name consisting of a string of alphanumeric characters and dashes separated by periods, that maps to IP numbers. The Top Level Domain (TLD) or Extension identifies an organization, group, or purpose for the site.

(WWW): the network of pages of images, texts and sounds on the Internet which can be viewed using browser software. The WWW is a small segment of the much larger Internet. (http://www.medialit.org/reading_room/article565.html)