An activity is an individual step (service) within a business process, such as getting customer details.
An activity in a process map may have various uses, such as:
A call to a script that runs automatically or requires feedback from a user, such as a form to be filled.
A call to a third-party software component to automatically send email.
An ordinary activity that facilitates the passing of output and input variables to other parts of the business process.
See Add an activity.