The usual dependency relationship between two tasks is that when one task ends, the dependent task may begin. In some instances, you may want a task to begin within a specified time after another task’s start or finish. This period of time is called lag time.
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With a finish-to-start lag, you specify a
period in which the dependent task can begin after the first task ends.
With a start-to-start lag, you specify a period in which the dependent task can begin after the first task begins.
In either case, the amount of time each task takes is not changed—there is simply a delay or an overlap between the work on the tasks.