You can create several types of reference points to use as construction objects. You can also create multiple reference points that are a specified distance apart on curves.
Click to toggle the display of reference points.
When you select items, the SOLIDWORKS software attempts to select the appropriate point construction method. For example, if you select a face, SOLIDWORKS selects the Center of Face 
construction method in the PropertyManager. You can always select a different type of point construction method.