Final answer:
The Grouping tool is used to combine selected objects into one object in graphic design and presentation software, aiding in the creation of multimodal compositions.
Step-by-step explanation:
The tool commonly used to combine two or more selected objects into a single object in various applications is known as a Grouping tool. For instance, in graphic design software like Adobe Illustrator or image editing applications like Photoshop, the grouping function allows you to merge layers or objects to manipulate them as one single entity. Similarly, in presentation software like Microsoft PowerPoint, you can select multiple elements like shapes, images, or text boxes, and then use the 'Group' command under the 'Arrange' or 'Format' tab to treat them as a single object. This is a fundamental technique in creating multimodal compositions, which can include combinations of text, images, and other visual elements to convey information effectively.