Which of the following is a widely used online collaboration tool?

Google Workspace is recognized as a widely used online collaboration tool because it encompasses a suite of applications designed for real-time collaboration and communication. This platform includes tools like Google Docs, Google Sheets, and Google Slides, enabling multiple users to work on documents simultaneously from different locations. Such features promote teamwork and streamline workflows, making it a practical choice for businesses and organizations.

In contrast, the other options focus primarily on individual productivity rather than collaboration. Microsoft Paint and Adobe Photoshop are graphic design applications, primarily used for creating and editing images rather than facilitating collaboration among teams. Notepad is a simple text editing tool that lacks the features necessary for real-time collaboration or sharing among users. Thus, the collaborative features and integrated functionality of Google Workspace make it the standout choice in this context.