Most Recently Used (MRU) is a data based feature under Microsoft which detects in cached the most recently used items. In other terms, it means that same refer to a list of programs, files and documents that has been recently accessed. This feature is suitable in the sense that users can quickly access their most recently used files quickly. However the awkwardness of this feature that your confidentiality is not considered within this. This can become problematic especially for shared computers. MRU allows other users to depict the documents you have accessed and this can be vulnerable in terms of pivacy violation
Most obviously, there exist programs and tools to deactivate or delete this device.