Which of the following is categorized as a web application?

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The categorization of a web application refers to software that is accessed and used through a web browser, typically over the internet, without requiring local installation on a user's device. Google Docs falls squarely into this definition, as it allows users to create, edit, and collaborate on documents online in real-time without downloading any software.

In contrast, applications like Microsoft Word, Adobe Photoshop, and Notepad are traditional desktop applications. They are installed directly on a user's operating system and generally require local system resources to function. These applications do not operate primarily through a web environment, which is what distinguishes a web application from desktop software. Thus, Google Docs exemplifies a web application due to its cloud-based functionality and accessibility from various devices via a web browser.