What does the Append tool update in an existing dataset?

The Append tool in ArcGIS Pro is designed specifically to add new data to an existing dataset. When you utilize this tool, it focuses on merging additional features from the source dataset into an already existing target dataset. This allows for the incorporation of new features without altering the original data points; rather, it updates the dataset by integrating additional information.

Using the Append tool does not change the original features or their attributes within the target dataset but complements it with new features from a different source. This functionality is particularly useful in scenarios where datasets need to be expanded, such as adding new observation points, records, or any other relevant additional data that fits into the existing framework of the dataset.

The other options either do not accurately reflect the purpose of the Append tool or misinterpret its capabilities. For example, it does not solely update metadata or modify spatial references. Instead, its primary function is to enhance the dataset by adding new features, making the correct choice one that highlights the tool's capability to integrate and expand existing features with additional data.