What would be the output of using Union in GIS?

Using Union in GIS combines the geometries of two feature classes, resulting in a new feature class that contains all features from both input classes, including distinct features and overlapping areas. The Union operation not only preserves the characteristics of each individual layer but also creates new features where the input geometries intersect. This means that areas where the features from both classes overlap will be represented, along with features that are unique to each input class.

The result of a Union operation is a comprehensive dataset that reflects the total spatial extent of both input feature classes, capturing every aspect of their geometries. This is particularly useful for spatial analysis, as it enables analysts to assess relationships and interactions between different spatial datasets effectively.