The terms below are used when discussing predecessors.
Predecessor: A job, process flow, or process flow component that is a dependency for another task to run. In the image below, the process flow component FTP is a predecessor of the DATA_LOAD component.
A simple two- component process flow.
Predecessor link: The link from a job, process flow, or process flow component to its predecessor. In the image above, a green arrow represents the Success predecessor link from DATA_LOAD to FTP. The link type you select for a predecessor dictates the requirements for when the task can run.
Successor: The task which runs based on its predecessor(s). In the image above, DATA_LOAD is the successor of FTP.
Successor link: The link from a job, process flow, or process flow component to its successor. In the image above the same green arrow that represents the predecessor link from DATA_LOAD to FTP also represents the successor link from FTP to DATA_LOAD. They are one and the same; the terms are just used in different contexts.