885b6512_Spatial_Join__Analysis___Datatype
[Parameter] Target Features (Required) [Explanation] The dataset that you are joining to. The output of the join operation will contain the features from this feature class with appended columns from the join feature class. It can be any spatial data source (shapefiles, SDE feature classes, coverages, SDC, query tables etc) supported by ArcGIS. It can also be read only. [Datatype] 
Feature Layer
F e a t u r e L a y e r
F e a t u r e C l a s s
S t r i n g
B o o l e a n
F i e l d M a p p i n g s
L i n e a r u n i t
Spatial Join (Analysis)