The "track changes" feature is a helpful tool in software like Microsoft Word that allows users to edit documents while keeping a record of all modifications. When someone makes changes, such as adding or deleting text, these alterations are highlighted, making it easy to see what has been changed. This is especially useful for collaborative projects, where multiple people can review and suggest edits without losing the original content. Using "track changes" also enables users to accept or reject each modification individually. This way, the final document can be polished and refined based on feedback from others, ensuring that everyone’s input is considered before reaching the final version.