A delay on the link between a predecessor and a successor; for example to create a 5 day delay between finishing one task and starting another. Lag times can also be a percentage of the duration of the predecessor task. A negative value against a lag is known as a lead.'
SOURCE; microsoft project glossary-projectlearning.net
Lag is the time delay between the start or finish of an activity and the start or finish of its successor(s). See FINISH-TO-FINISH LAG, FINISH-TO-START LAG, and START-TO-START LAG.
The logical relationship between the start and/or finish of one activity and the start and/or finish of a following activity. For example, in a finish-to-start dependency with a 10 day lag, the successor activity cannot start until 10 days after the prede