What does the term "Internet" commonly refer to?

The term "Internet" commonly refers to the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide. Although the World Wide Web, which consists of interlinked hypertext documents accessed via the Internet, is a significant component of the Internet, it does not encompass the entirety of what the Internet is. The correct choice accurately captures the common understanding that people often associate the Internet with the World Wide Web due to its high visibility and use.

In contrast, the other options focus on different aspects related to technology. The first option mentions hardware devices, which are necessary for the Internet's function but do not define what the Internet itself is. The third option, referring to a type of programming language, is unrelated as programming languages help in software development rather than describing a communications network. Finally, the fourth option talks about software development methodologies, which again do not pertain to the concept of the Internet itself. Thus, while the World Wide Web is a primary interface for many users, the answer succinctly aligns with the widely accepted perspective that the term "Internet" is often synonymous with the World Wide Web in everyday conversations.