An Activity is very similar to a Command Step, except that Activities are reusable and cannot use input or output variables. The Activities pane shows a library of user-defined, reusable Activities that can reduce the amount of configuration necessary when building Templates.
Activities are exported / imported as xml files. These files can be exported/imported from one system to another.
Sentinel provides three types of actions that can be used to build Activities:
Incident Command Activity
Incident Internal Activity
Incident Composite Activity