SharePoint ULS, Explained.
Logging is the key element of any application. A strong logging system helps administrators to troubleshoot the problems and fix them accordingly. Like other Microsoft Applications, SharePoint also has a strong logging system called ULS (Unified Logging system) logging. In SharePoint space, every event / outcome written into the Logs has an associated unique ID which is known as Correlation ID. Normally this id is displayed in the error which makes administrator’s life easy to trace the error details in the logs.