The video below shows a quick overview of task link dependencies. In other words, one task is dependent upon another. When the first task is completed, the next one can start. What the video, then scroll down below it for more information.
There are four types of link relationships in this video:
As the names suggest, these link relationships are associated with task dates. Start and Finish dates affect other tasks. When a predecessor date changes, a successor task will be moved to reflect the link relationship.