Activities

Activities represent the work that is performed in a process. The work might be performed by a person or by a computer.

Tasks
Tasks represent the smallest unit of work in your process.
Subprocesses and linked processes
Subprocesses and linked processes allow you to capture the right level of detail about the activities in your process without over-complicating your diagram. A subprocess groups related activities into one parent activity, while a linked process is a call to another stand-alone process.
Repeated activities
Sometimes, a process activity is repeated multiple times.

Parent topic: Process diagrams