What kind of file formats can PowerPoint presentations be saved as?

PowerPoint allows users to save presentations in various file formats, each serving different purposes. The selected answer accurately reflects this flexibility. The .pptx format is the default for newer versions of PowerPoint, ensuring compatibility with many features including animations, transitions, and multimedia elements. The .ppt format is used for older versions of PowerPoint, maintaining backward compatibility.

The .pdf format is essential for sharing presentations in a format that preserves the layout and design, preventing alterations by others who may not have PowerPoint installed. Finally, the .ppsx file format is specifically designed for presentations that are meant to be viewed in slide show mode directly, making it ideal for sharing presentations that will be shown without allowing edits.

In contrast, other options include formats that either do not pertain to PowerPoint presentations or do not represent common functionality associated with presentations, such as .txt, .jpg, .png, .gif, .docx, and .xls. These formats serve different purposes: for example, .txt is used for plain text files, while .jpg, .png, and .gif are image formats, and .docx and .xls are word processing and spreadsheet formats, respectively. Therefore, the correctness of the answer lies in its inclusion