Hi what is hidden list in SharePoint 2010 and 2013? and how it is link with managed metadata service application.
With SharePoint 2010 and 2013, lists and libraries support lookup columns which appear to retrieve data from the term stores of the Managed Metadata Service. However, using Managed Metadata Columns within a site collection creates a hidden list at the site collection level which contains a subset of term store information at
<site collection URL>/Lists/TaxonomyHiddenList/AllItems.aspx.
This hidden list is simply one instance of localized storage of copies of external data within a site collection. Accessing this local data enhances performance but sometimes creates issues with incorrect data being presented.