Final answer:
Layer comps are the feature that allow for managing multiple versions of a document in a single file, useful for presenting design variations in applications like Adobe Photoshop.
Step-by-step explanation:
The feature that allows you to create, manage, and view multiple versions of your document within a single file is layer comps. Layer comps enable you to save the visibility, position, and appearance of layers in your document and easily switch between these different views without having to save multiple files. This is particularly useful in applications like Adobe Photoshop where you may want to present different design options within the same document. By using layer comps, you can efficiently manage variations of your work and streamline your workflow