You have probably noticed that in Power BI service Datasets have recently been replaced by Semantic Models. Model Explorer is a new feature of Power BI Desktop. It is located in the Model view, and enables views and work with complex semantic models that contain tables, relations, measures, roles, calculation groups, cultures, perspectives…
In addition to options we use on daily basis Data model has some advanced options too. With them, we can define the perspective view on the table. Also, we can determine the behavior of columns when they are dragged in the Pivot Table, as well as to set additional attributes table that can be used when creating reports. Finally, it is possible to make one or more synonyms for each column, which later makes it easier to search the model.