Shrinkage refers to the reduction in workforce availability due to various reasons. There are two types of shrinkage: planned and unplanned. In the video, the speaker explains these types using an example of 30 employees in an organization who require rotational week offs. For instance, in a BPO setting where employees work 7 days a week, they must be given week offs one by one to manage the workforce effectively. The video delves into the importance of understanding and managing shrinkage in a work environment to ensure smooth operations. #vizard