The question asks us to identify which of the given options is not a web browser. Let's look at each option to understand what it is.

Understanding Web Browsers

A web browser is a software application used to access and view websites on the internet. It fetches data from the internet and displays web pages, images, videos, and other content to the user. Common examples include Chrome, Firefox, Safari, Edge, and Opera.

Analyzing the Options

Let's examine each option provided:

• Opera: Opera is a well-known web browser developed by Opera Software. It has been around for many years and offers various features for browsing the web.
• Google apps: "Google apps" usually refers to a suite of online productivity and collaboration tools offered by Google, such as Gmail, Google Docs, Google Sheets, Google Drive, Google Calendar, etc. While these apps are often accessed using a web browser, Google apps themselves are the applications, not the browser software used to open them.
• Vivaldi: Vivaldi is a relatively newer web browser developed by Vivaldi Technologies. It is based on the Chromium project and is known for its high level of customization features.
• Mozilla Firefox: Mozilla Firefox is a very popular, free, and open-source web browser developed by the Mozilla Foundation. It is widely used across different operating systems.

Identifying the Non-Browser

From the analysis above, we can see that Opera, Vivaldi, and Mozilla Firefox are all distinct software applications designed specifically for browsing the web. They are web browsers.

"Google apps," on the other hand, is a collection or suite of different applications and services provided by Google. These are typically accessed *using* a web browser, but they are not the browser itself.

Conclusion

Therefore, out of the given options, Google apps is not a web browser. It is a collection of online applications.