The Block is acts as the collector. Simply put, it is a grid, each element of which is the output object of plugin (Place, Ad or Zone).
This is the list of Blocks created by you.
Zone is an object that acts as a selector of Ads Places.
This is the list of Zones created by you.
Place (Ad Place) is an object that is a virtual representation of the physical place on the page, which will show ads linked to this Place. This object includes all the properties and methods necessary for displaying and rotation of all attached ads. This is the main object of the SAM Pro Free plugin that provides its functionality. You can set the required property values you want for each instance of the object using the Place Editor.