Difference between Reset and Private context of a datagrid

Can anybody explain what the difference is between the 'Reset' and 'Private' settings, which you can set in the context behavior of a datagrid?
1 answers

Reset means that all context is removed.

Private means all context is removed except for the current object. So, no automatic constraints are added by the Mendix Client but you can still use the [%CurrentObject%] token in the XPath constraint of your datagrid. This token points to the object of the enclosing dataview.

See this question and its answers for some background information about 'context'.