Datasets can have reviews. Specifically, if a review dataset points at (using the itemReviewedUrl field) the URL form of a persistent ID of a dataset (e.g. https://doi.org/10.5072/FK2/ABCDEF) that is in the same Dataverse installation as the review dataset, the review dataset will be included in the list of reviews for the dataset. It is considered a local review.
See the guides, #12313 and #12327.