Which commonly used file format retains a history of document changes and revisions?

The DOCX format is specifically designed to handle rich text documents and includes built-in features for tracking changes, revisions, and comments. This format retains a history of edits when using applications like Microsoft Word, making it possible to collaborate on documents while keeping track of modifications made by various users over time. This functionality is particularly useful in professional settings where documentation needs to reflect a clear revision history and allow multiple contributors to manage edits effectively.

In contrast, the TXT format is a plain text format that does not support any form of change tracking or revisions; it simply stores text without additional features. The PDF format, while commonly used for document sharing, primarily preserves the visual layout of a document rather than retaining a history of changes made to the content. Lastly, the JPEG format is an image format that likewise does not include any functionality for tracking document revisions, as it is intended for storing pictures rather than text documents. Therefore, the DOCX format stands out due to its capacity for managing and retaining a comprehensive history of document changes and revisions.