Which of the following tools is commonly used for video conferencing?

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The correct answer is Skype because it is specifically designed for enabling video conferencing, allowing users to conduct virtual meetings, communicate in real time through video and audio, and share screens. This makes it a popular choice for both personal and professional use, facilitating remote communication and collaboration among individuals and teams.

In contrast, Excel, PowerPoint, and Photoshop serve different purposes. Excel is primarily a spreadsheet application used for data analysis and financial calculations, while PowerPoint is a presentation software used to create slideshows and visual aids for presentations. Photoshop, on the other hand, is an image editing tool focused on creating and modifying visual graphics, with no inherent capabilities for video conferencing. Thus, their functionality does not align with the requirements for video conferencing, making them unsuitable choices in this context.