The Finish to Start dependency is the default link type applied. It forces a task to start only when/after its predecessor/successor has finished; predecessor/successor finishes and the other starts.A link can also have a “lag” value specified. Finish-to-start is the most common dependency type. If a nonzero lag is present, it is added to the Start date; otherwise, the task starts immediately after the predecessor/successor is completed. A positive lag value will create a gap between the finish of one task and the start of another.